path: root/openttd-git/chunnel.patch

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index bbe66b7645..7fb18d527a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -442,6 +442,7 @@ add_files(
     tree_cmd.cpp
     tree_gui.cpp
     tree_map.h
+    tunnel_base.h
     tunnel_map.cpp
     tunnel_map.h
     tunnelbridge.h
diff --git a/src/ground_vehicle.cpp b/src/ground_vehicle.cpp
index 0f1915c964..0a734a5b55 100644
--- a/src/ground_vehicle.cpp
+++ b/src/ground_vehicle.cpp
@@ -11,6 +11,8 @@
 #include "train.h"
 #include "roadveh.h"
 #include "depot_map.h"
+#include "tunnel_base.h"
+#include "slope_type.h"
 
 #include "safeguards.h"
 
@@ -203,6 +205,69 @@ bool GroundVehicle<T, Type>::IsChainInDepot() const
 	return true;
 }
 
+/**
+ * Updates vehicle's Z inclination inside a wormhole, where applicable.
+ */
+template <class T, VehicleType Type>
+void GroundVehicle<T, Type>::UpdateZPositionInWormhole()
+{
+	if (!IsTunnel(this->tile)) return;
+
+	const Tunnel *t = Tunnel::GetByTile(this->tile);
+	if (!t->is_chunnel) return;
+
+	TileIndex pos_tile = TileVirtXY(this->x_pos, this->y_pos);
+
+	ClrBit(this->gv_flags, GVF_GOINGUP_BIT);
+	ClrBit(this->gv_flags, GVF_GOINGDOWN_BIT);
+
+	if (pos_tile == t->tile_n || pos_tile == t->tile_s) {
+		this->z_pos = 0;
+		return;
+	}
+
+	int north_coord, south_coord, pos_coord;
+	Slope slope = SLOPE_FLAT;
+	int delta;
+	if (t->tile_s - t->tile_n > MapMaxX()) {
+		// tunnel extends along Y axis (DIAGDIR_SE from north end), has same X values
+		north_coord = TileY(t->tile_n);
+		south_coord = TileY(t->tile_s);
+		pos_coord = TileY(pos_tile);
+
+		if ((delta = pos_coord - north_coord) <= 3) {
+			this->z_pos = TILE_HEIGHT * (delta == 3 ? -2 : -1);
+			if (delta != 2) {
+				slope = SLOPE_NW;
+				SetBit(this->gv_flags, this->direction == DIR_NW ? GVF_GOINGUP_BIT : GVF_GOINGDOWN_BIT);
+			}
+		} else if ((delta = south_coord - pos_coord) <= 3) {
+			this->z_pos = TILE_HEIGHT * (delta == 3 ? -2 : -1);
+			if (delta != 2) {
+				slope = SLOPE_ELEVATED ^ SLOPE_NW;
+				SetBit(this->gv_flags, this->direction == DIR_NW ? GVF_GOINGDOWN_BIT : GVF_GOINGUP_BIT);
+			}
+		}
+	} else {
+		// tunnel extends along X axis (DIAGDIR_SW from north end), has same Y values
+		north_coord = TileX(t->tile_n);
+		south_coord = TileX(t->tile_s);
+		pos_coord = TileX(pos_tile);
+
+		if ((delta = pos_coord - north_coord) <= 3) {
+			this->z_pos = TILE_HEIGHT * (delta == 3 ? -3 : (delta == 2 ? -2 : -1));
+			slope = SLOPE_NE;
+			SetBit(this->gv_flags, this->direction == DIR_NE ? GVF_GOINGUP_BIT : GVF_GOINGDOWN_BIT);
+		} else if ((delta = south_coord - pos_coord) <= 3) {
+			this->z_pos = TILE_HEIGHT * (delta == 3 ? -3 : (delta == 2 ? -2 : -1));
+			slope = SLOPE_ELEVATED ^ SLOPE_NE;
+			SetBit(this->gv_flags, this->direction == DIR_NE ? GVF_GOINGDOWN_BIT : GVF_GOINGUP_BIT);
+		}
+	}
+
+	if (slope != SLOPE_FLAT) this->z_pos += GetPartialPixelZ(this->x_pos & 0xF, this->y_pos & 0xF, slope);
+}
+
 /* Instantiation for Train */
 template struct GroundVehicle<Train, VEH_TRAIN>;
 /* Instantiation for RoadVehicle */
diff --git a/src/ground_vehicle.hpp b/src/ground_vehicle.hpp
index af6e25c806..ae4e9ead11 100644
--- a/src/ground_vehicle.hpp
+++ b/src/ground_vehicle.hpp
@@ -14,6 +14,7 @@
 #include "vehicle_gui.h"
 #include "landscape.h"
 #include "window_func.h"
+#include "tunnel_map.h"
 #include "widgets/vehicle_widget.h"
 
 /** What is the status of our acceleration? */
@@ -52,6 +53,7 @@ enum GroundVehicleFlags {
 	GVF_GOINGUP_BIT              = 0,  ///< Vehicle is currently going uphill. (Cached track information for acceleration)
 	GVF_GOINGDOWN_BIT            = 1,  ///< Vehicle is currently going downhill. (Cached track information for acceleration)
 	GVF_SUPPRESS_IMPLICIT_ORDERS = 2,  ///< Disable insertion and removal of automatic orders until the vehicle completes the real order.
+	GVF_CHUNNEL_BIT              = 3,  ///< Vehicle may currently be in a chunnel. (Cached track information for inclination changes)
 };
 
 /**
@@ -220,20 +222,28 @@ struct GroundVehicle : public SpecializedVehicle<T, Type> {
 			this->z_pos += HasBit(this->gv_flags, GVF_GOINGUP_BIT) ? d : -d;
 		}
 
+		if (HasBit(this->gv_flags, GVF_CHUNNEL_BIT) && !IsTunnelTile(this->tile)) {
+			ClrBit(this->gv_flags, GVF_CHUNNEL_BIT);
+		}
+
 		assert(this->z_pos == GetSlopePixelZ(this->x_pos, this->y_pos));
 	}
 
+	void UpdateZPositionInWormhole();
+
 	/**
 	 * Checks if the vehicle is in a slope and sets the required flags in that case.
 	 * @param new_tile True if the vehicle reached a new tile.
 	 * @param update_delta Indicates to also update the delta.
 	 * @return Old height of the vehicle.
 	 */
-	inline int UpdateInclination(bool new_tile, bool update_delta)
+	inline int UpdateInclination(bool new_tile, bool update_delta, bool in_wormhole = false)
 	{
 		int old_z = this->z_pos;
 
-		if (new_tile) {
+		if (in_wormhole) {
+			if (HasBit(this->gv_flags, GVF_CHUNNEL_BIT)) this->UpdateZPositionInWormhole();
+		} else if (new_tile) {
 			this->UpdateZPositionAndInclination();
 		} else {
 			this->UpdateZPosition();
diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index 816146212f..5491936557 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -20,6 +20,7 @@
 #include "company_base.h"
 #include "genworld.h"
 #include "tree_map.h"
+#include "tunnel_map.h"
 #include "newgrf_cargo.h"
 #include "newgrf_debug.h"
 #include "newgrf_industrytiles.h"
@@ -1521,6 +1522,11 @@ static CommandCost CheckIfIndustryIsAllowed(TileIndex tile, int type, const Town
 		return_cmd_error(STR_ERROR_CAN_ONLY_BE_BUILT_NEAR_TOWN_CENTER);
 	}
 
+	if (type == IT_OIL_RIG &&
+			(IsTunnelInWay(tile, 0) ||
+			IsTunnelInWay(tile + TileDiffXY(0, 1), 0) ||
+			IsTunnelInWay(tile + TileDiffXY(1, 2), 0))) return_cmd_error(STR_ERROR_NO_DRILLING_ABOVE_CHUNNEL);
+
 	return CommandCost();
 }
 
diff --git a/src/lang/english.txt b/src/lang/english.txt
index 8d8a128717..765fc146a1 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -2321,6 +2321,7 @@ STR_TRANSPARENT_BRIDGES_TOOLTIP                                 :{BLACK}Toggle t
 STR_TRANSPARENT_STRUCTURES_TOOLTIP                              :{BLACK}Toggle transparency for structures like lighthouses and antennas. Ctrl+Click to lock
 STR_TRANSPARENT_CATENARY_TOOLTIP                                :{BLACK}Toggle transparency for catenary. Ctrl+Click to lock
 STR_TRANSPARENT_LOADING_TOOLTIP                                 :{BLACK}Toggle transparency for loading indicators. Ctrl+Click to lock
+STR_TRANSPARENT_TUNNELS_TOOLTIP                                 :{BLACK}Toggle transparency for vehicles in tunnels. Ctrl+Click to lock.
 STR_TRANSPARENT_INVISIBLE_TOOLTIP                               :{BLACK}Set objects invisible instead of transparent
 
 # Linkgraph legend window
@@ -2720,7 +2721,9 @@ STR_LAI_WATER_DESCRIPTION_SHIP_DEPOT                            :Ship depot
 # Industries come directly from their industry names
 
 STR_LAI_TUNNEL_DESCRIPTION_RAILROAD                             :Railway tunnel
+STR_LAI_TUNNEL_DESCRIPTION_RAILROAD_CHUNNEL                     :Railway tunnel (underwater)
 STR_LAI_TUNNEL_DESCRIPTION_ROAD                                 :Road tunnel
+STR_LAI_TUNNEL_DESCRIPTION_ROAD_CHUNNEL                         :Road tunnel (underwater)
 
 STR_LAI_BRIDGE_DESCRIPTION_RAIL_SUSPENSION_STEEL                :Steel suspension rail bridge
 STR_LAI_BRIDGE_DESCRIPTION_RAIL_GIRDER_STEEL                    :Steel girder rail bridge
@@ -4542,6 +4545,10 @@ STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY                             :{WHITE}Another
 STR_ERROR_TUNNEL_THROUGH_MAP_BORDER                             :{WHITE}Tunnel would end out of the map
 STR_ERROR_UNABLE_TO_EXCAVATE_LAND                               :{WHITE}Unable to excavate land for other end of tunnel
 STR_ERROR_TUNNEL_TOO_LONG                                       :{WHITE}... tunnel too long
+STR_ERROR_TUNNEL_RAMP_TOO_SHORT                                 :{WHITE}... ramp too short, tunnels under water must have a ramp at least three tiles long at both ends.
+STR_ERROR_TUNNEL_TOO_MANY                                       :{WHITE}... too many tunnels
+STR_ERROR_NO_DRILLING_ABOVE_CHUNNEL                             :{WHITE}No oil rigs allowed above underwater tunnels.
+STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY_FOR_CHUNNEL                 :{WHITE}Three tiles are needed to pass under the other tunnel.
 
 # Object related errors
 STR_ERROR_TOO_MANY_OBJECTS                                      :{WHITE}... too many objects
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
index 14fa8d79d8..604b51ea46 100644
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -1178,6 +1178,7 @@ bool IndividualRoadVehicleController(RoadVehicle *v, const RoadVehicle *prev)
 		v->x_pos = gp.x;
 		v->y_pos = gp.y;
 		v->UpdatePosition();
+		RoadZPosAffectSpeed(v, v->UpdateInclination(false, false, true));
 		if ((v->vehstatus & VS_HIDDEN) == 0) v->Vehicle::UpdateViewport(true);
 		return true;
 	}
@@ -1545,7 +1546,7 @@ again:
 	v->x_pos = x;
 	v->y_pos = y;
 	v->UpdatePosition();
-	RoadZPosAffectSpeed(v, v->UpdateInclination(false, true));
+	RoadZPosAffectSpeed(v, v->UpdateInclination(false, true, v->state == RVSB_WORMHOLE));
 	return true;
 }
 
diff --git a/src/saveload/CMakeLists.txt b/src/saveload/CMakeLists.txt
index 52f103fa7e..c888a899cd 100644
--- a/src/saveload/CMakeLists.txt
+++ b/src/saveload/CMakeLists.txt
@@ -38,6 +38,7 @@ add_files(
     story_sl.cpp
     subsidy_sl.cpp
     town_sl.cpp
+    tunnel_sl.cpp
     vehicle_sl.cpp
     waypoint_sl.cpp
 )
diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index 329152ab27..7ebefb7ad7 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -11,6 +11,7 @@
 #include "../void_map.h"
 #include "../signs_base.h"
 #include "../depot_base.h"
+#include "../tunnel_base.h"
 #include "../fios.h"
 #include "../gamelog_internal.h"
 #include "../network/network.h"
@@ -534,6 +535,25 @@ static inline bool MayHaveBridgeAbove(TileIndex t)
 			IsTileType(t, MP_WATER) || IsTileType(t, MP_TUNNELBRIDGE) || IsTileType(t, MP_OBJECT);
 }
 
+TileIndex GetOtherTunnelBridgeEndOld(TileIndex tile)
+{
+	DiagDirection dir = GetTunnelBridgeDirection(tile);
+	TileIndexDiff delta = TileOffsByDiagDir(dir);
+	int z = GetTileZ(tile);
+
+	dir = ReverseDiagDir(dir);
+	do {
+		tile += delta;
+	} while (
+		!IsTunnelTile(tile) ||
+		GetTunnelBridgeDirection(tile) != dir ||
+		GetTileZ(tile) != z
+	);
+
+	return tile;
+}
+
+
 /**
  * Perform a (large) amount of savegame conversion *magic* in order to
  * load older savegames and to fill the caches for various purposes.
@@ -1944,6 +1964,32 @@ bool AfterLoadGame()
 		}
 	}
 
+	/* Tunnel pool has to be initiated before reservations. */
+	if (IsSavegameVersionBefore(SLV_196)) {
+		for (TileIndex t = 0; t < map_size; t++) {
+			if (IsTunnelTile(t)) {
+				DiagDirection dir = GetTunnelBridgeDirection(t);
+				if (dir == DIAGDIR_SE || dir == DIAGDIR_SW) {
+					TileIndex start_tile = t;
+					TileIndex end_tile = GetOtherTunnelBridgeEndOld(start_tile);
+
+					if (!Tunnel::CanAllocateItem()) {
+						SetSaveLoadError(STR_ERROR_TUNNEL_TOO_MANY);
+						/* Restore the signals */
+						ResetSignalHandlers();
+						return false;
+					}
+
+					const Tunnel *t = new Tunnel(start_tile, end_tile, false);
+
+					_m[start_tile].m2 = t->index;
+					_m[end_tile].m2 = t->index;
+				}
+			}
+		}
+	}
+
+
 	/* Move the signal variant back up one bit for PBS. We don't convert the old PBS
 	 * format here, as an old layout wouldn't work properly anyway. To be safe, we
 	 * clear any possible PBS reservations as well. */
@@ -2547,7 +2593,7 @@ bool AfterLoadGame()
 			} else if (dir == ReverseDiagDir(vdir)) { // Leaving tunnel
 				hidden = frame < TILE_SIZE - _tunnel_visibility_frame[dir];
 				/* v->tile changes at the moment when the vehicle leaves the tunnel. */
-				v->tile = hidden ? GetOtherTunnelBridgeEnd(vtile) : vtile;
+				v->tile = hidden ? GetOtherTunnelBridgeEndOld(vtile) : vtile;
 			} else {
 				/* We could get here in two cases:
 				 * - for road vehicles, it is reversing at the end of the tunnel
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index 1b79ad926b..69e8b60905 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -248,6 +248,7 @@ extern const ChunkHandler _linkgraph_chunk_handlers[];
 extern const ChunkHandler _airport_chunk_handlers[];
 extern const ChunkHandler _object_chunk_handlers[];
 extern const ChunkHandler _persistent_storage_chunk_handlers[];
+extern const ChunkHandler _tunnel_chunk_handlers[];
 
 /** Array of all chunks in a savegame, \c nullptr terminated. */
 static const ChunkHandler * const _chunk_handlers[] = {
@@ -284,6 +285,8 @@ static const ChunkHandler * const _chunk_handlers[] = {
 	_airport_chunk_handlers,
 	_object_chunk_handlers,
 	_persistent_storage_chunk_handlers,
+	_tunnel_chunk_handlers,
+
 	nullptr,
 };
 
diff --git a/src/saveload/tunnel_sl.cpp b/src/saveload/tunnel_sl.cpp
new file mode 100644
index 0000000000..7ad37b12b9
--- /dev/null
+++ b/src/saveload/tunnel_sl.cpp
@@ -0,0 +1,48 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file tunnel_sl.cpp Code handling saving and loading of tunnels */
+
+#include "../stdafx.h"
+#include "../tunnel_base.h"
+
+#include "saveload.h"
+
+#include "../safeguards.h"
+
+
+static const SaveLoad _tunnel_desc[] = {
+	 SLE_CONDVAR(Tunnel, tile_n,           SLE_UINT32,             SLV_196, SL_MAX_VERSION),
+	 SLE_CONDVAR(Tunnel, tile_s,           SLE_UINT32,             SLV_196, SL_MAX_VERSION),
+	 SLE_CONDVAR(Tunnel, is_chunnel,         SLE_BOOL,             SLV_196, SL_MAX_VERSION),
+	 SLE_END()
+};
+
+static void Save_TUNN()
+{
+	for(Tunnel *tunnel : Tunnel::Iterate()) {
+		SlSetArrayIndex(tunnel->index);
+		SlObject(tunnel, _tunnel_desc);
+	}
+}
+
+static void Load_TUNN()
+{
+	int index;
+
+	while ((index = SlIterateArray()) != -1) {
+		Tunnel *tunnel = new (index) Tunnel();
+		SlObject(tunnel, _tunnel_desc);
+	}
+}
+
+
+extern const ChunkHandler _tunnel_chunk_handlers[] = {
+	{ 'TUNN', Save_TUNN, Load_TUNN, nullptr, nullptr, CH_ARRAY | CH_LAST},
+};
diff --git a/src/table/misc_settings.ini b/src/table/misc_settings.ini
index edad848165..f0322ee359 100644
--- a/src/table/misc_settings.ini
+++ b/src/table/misc_settings.ini
@@ -254,7 +254,7 @@ type     = SLE_UINT
 var      = _transparency_opt
 def      = 0
 min      = 0
-max      = 0x1FF
+max      = 0x3FF
 cat      = SC_BASIC
 
 [SDTG_VAR]
@@ -263,7 +263,7 @@ type     = SLE_UINT
 var      = _transparency_lock
 def      = 0
 min      = 0
-max      = 0x1FF
+max      = 0x3FF
 cat      = SC_BASIC
 
 [SDTG_VAR]
diff --git a/src/terraform_cmd.cpp b/src/terraform_cmd.cpp
index 85edb73128..1a902dd59c 100644
--- a/src/terraform_cmd.cpp
+++ b/src/terraform_cmd.cpp
@@ -268,7 +268,7 @@ CommandCost CmdTerraformLand(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 					}
 				}
 				/* Check if tunnel would take damage */
-				if (direction == -1 && IsTunnelInWay(tile, z_min)) {
+				if (direction == -1 && IsTunnelInWay(tile, z_min, true)) {
 					_terraform_err_tile = tile; // highlight the tile above the tunnel
 					return_cmd_error(STR_ERROR_EXCAVATION_WOULD_DAMAGE);
 				}
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index ae9cb45de3..a9ca119ec3 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -1563,6 +1563,7 @@ static void UpdateStatusAfterSwap(Train *v)
 	}
 
 	v->UpdatePosition();
+	if (v->track == TRACK_BIT_WORMHOLE) v->UpdateInclination(false, false, true);
 	v->UpdateViewport(true, true);
 }
 
@@ -3326,6 +3327,15 @@ bool TrainController(Train *v, Vehicle *nomove, bool reverse)
 				v->x_pos = gp.x;
 				v->y_pos = gp.y;
 				v->UpdatePosition();
+				if (v->track == TRACK_BIT_WORMHOLE) {
+					/* update the Z position of the vehicle */
+					int old_z = v->UpdateInclination(false, false, true);
+
+					if (prev == nullptr) {
+						/* This is the first vehicle in the train */
+						AffectSpeedByZChange(v, old_z);
+					}
+				}
 				if ((v->vehstatus & VS_HIDDEN) == 0) v->Vehicle::UpdateViewport(true);
 				continue;
 			}
@@ -3339,7 +3349,7 @@ bool TrainController(Train *v, Vehicle *nomove, bool reverse)
 		v->UpdatePosition();
 
 		/* update the Z position of the vehicle */
-		int old_z = v->UpdateInclination(gp.new_tile != gp.old_tile, false);
+		int old_z = v->UpdateInclination(gp.new_tile != gp.old_tile, false, v->track == TRACK_BIT_WORMHOLE);
 
 		if (prev == nullptr) {
 			/* This is the first vehicle in the train */
@@ -3853,7 +3863,7 @@ static bool TrainLocoHandler(Train *v, bool mode)
 	}
 
 	for (Train *u = v; u != nullptr; u = u->Next()) {
-		if ((u->vehstatus & VS_HIDDEN) != 0) continue;
+		if (!u->IsDrawn()) continue;
 
 		u->UpdateViewport(false, false);
 	}
diff --git a/src/transparency.h b/src/transparency.h
index 54ba24e933..08b13ca9b9 100644
--- a/src/transparency.h
+++ b/src/transparency.h
@@ -29,6 +29,7 @@ enum TransparencyOption {
 	TO_STRUCTURES, ///< other objects such as transmitters and lighthouses
 	TO_CATENARY,   ///< catenary
 	TO_LOADING,    ///< loading indicators
+	TO_TUNNELS,    ///< vehicles in tunnels
 	TO_END,
 	TO_INVALID,    ///< Invalid transparency option
 };
diff --git a/src/transparency_gui.cpp b/src/transparency_gui.cpp
index 153dcb5d03..611094cdeb 100644
--- a/src/transparency_gui.cpp
+++ b/src/transparency_gui.cpp
@@ -50,7 +50,8 @@ public:
 			case WID_TT_BRIDGES:
 			case WID_TT_STRUCTURES:
 			case WID_TT_CATENARY:
-			case WID_TT_LOADING: {
+			case WID_TT_LOADING:
+			case WID_TT_TUNNELS: {
 				uint i = widget - WID_TT_BEGIN;
 				if (HasBit(_transparency_lock, i)) DrawSprite(SPR_LOCK, PAL_NONE, r.left + 1, r.top + 1);
 				break;
@@ -58,6 +59,7 @@ public:
 			case WID_TT_BUTTONS:
 				for (uint i = WID_TT_BEGIN; i < WID_TT_END; i++) {
 					if (i == WID_TT_LOADING) continue; // Do not draw button for invisible loading indicators.
+					if (i == WID_TT_TUNNELS) continue; // Do not draw button for invisible vehicles in tunnels.
 
 					const NWidgetBase *wi = this->GetWidget<NWidgetBase>(i);
 					DrawFrameRect(wi->pos_x + 1, r.top + 2, wi->pos_x + wi->current_x - 2, r.bottom - 2, COLOUR_PALE_GREEN,
@@ -69,7 +71,7 @@ public:
 
 	void OnClick(Point pt, int widget, int click_count) override
 	{
-		if (widget >= WID_TT_BEGIN && widget < WID_TT_END) {
+		if (IsInsideMM(widget, WID_TT_BEGIN, WID_TT_END)) {
 			if (_ctrl_pressed) {
 				/* toggle the bit of the transparencies lock variable */
 				ToggleTransparencyLock((TransparencyOption)(widget - WID_TT_BEGIN));
@@ -139,6 +141,7 @@ static const NWidgetPart _nested_transparency_widgets[] = {
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_TT_STRUCTURES), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_TRANSMITTER, STR_TRANSPARENT_STRUCTURES_TOOLTIP),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_TT_CATENARY), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_BUILD_X_ELRAIL, STR_TRANSPARENT_CATENARY_TOOLTIP),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_TT_LOADING), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_TRAINLIST, STR_TRANSPARENT_LOADING_TOOLTIP),
+		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_TT_TUNNELS), SetMinimalSize(22, 22), SetFill(0, 1), SetDataTip(SPR_IMG_ROAD_TUNNEL, STR_TRANSPARENT_TUNNELS_TOOLTIP),
 		NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetFill(1, 1), EndContainer(),
 	EndContainer(),
 	/* Panel with 'invisibility' buttons. */
diff --git a/src/tunnel_base.h b/src/tunnel_base.h
new file mode 100644
index 0000000000..4a2493fa7f
--- /dev/null
+++ b/src/tunnel_base.h
@@ -0,0 +1,39 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file tunnel_base.h Base for all tunnels */
+
+#ifndef TUNNEL_BASE_H
+#define TUNNEL_BASE_H
+
+#include "tunnel_map.h"
+#include "core/pool_type.hpp"
+
+struct Tunnel;
+
+typedef Pool<Tunnel, TunnelID, 64, 64000> TunnelPool;
+extern TunnelPool _tunnel_pool;
+
+struct Tunnel : TunnelPool::PoolItem<&_tunnel_pool> {
+
+	TileIndex tile_n; // North tile of tunnel.
+	TileIndex tile_s; // South tile of tunnel.
+	bool is_chunnel;
+
+	Tunnel() {}
+	Tunnel(TileIndex tile_n, TileIndex tile_s, bool is_chunnel) : tile_n(tile_n), tile_s(tile_s), is_chunnel(is_chunnel) {}
+	~Tunnel();
+
+	static inline Tunnel *GetByTile(TileIndex tile)
+	{
+		return Tunnel::Get(GetTunnelIndex(tile));
+	}
+};
+
+#endif /* TUNNEL_BASE_H */
diff --git a/src/tunnel_map.cpp b/src/tunnel_map.cpp
index 9de5235801..6234193e1e 100644
--- a/src/tunnel_map.cpp
+++ b/src/tunnel_map.cpp
@@ -10,63 +10,62 @@
 #include "stdafx.h"
 #include "tunnelbridge_map.h"
 
+#include "core/pool_func.hpp"
+
 #include "safeguards.h"
 
+/** All tunnel portals tucked away in a pool. */
+TunnelPool _tunnel_pool("Tunnel");
+INSTANTIATE_POOL_METHODS(Tunnel)
 
 /**
- * Gets the other end of the tunnel. Where a vehicle would reappear when it
- * enters at the given tile.
- * @param tile the tile to search from.
- * @return the tile of the other end of the tunnel.
+ * Clean up a tunnel tile
  */
-TileIndex GetOtherTunnelEnd(TileIndex tile)
+Tunnel::~Tunnel()
 {
-	DiagDirection dir = GetTunnelBridgeDirection(tile);
-	TileIndexDiff delta = TileOffsByDiagDir(dir);
-	int z = GetTileZ(tile);
-
-	dir = ReverseDiagDir(dir);
-	do {
-		tile += delta;
-	} while (
-		!IsTunnelTile(tile) ||
-		GetTunnelBridgeDirection(tile) != dir ||
-		GetTileZ(tile) != z
-	);
-
-	return tile;
+	if (CleaningPool()) return;
 }
 
-
 /**
- * Is there a tunnel in the way in the given direction?
+ * Gets the other end of the tunnel. Where a vehicle would reappear when it
+ * enters at the given tile.
  * @param tile the tile to search from.
- * @param z    the 'z' to search on.
- * @param dir  the direction to start searching to.
- * @return true if and only if there is a tunnel.
+ * @return the tile of the other end of the tunnel.
  */
-bool IsTunnelInWayDir(TileIndex tile, int z, DiagDirection dir)
+TileIndex GetOtherTunnelEnd(TileIndex tile)
 {
-	TileIndexDiff delta = TileOffsByDiagDir(dir);
-	int height;
-
-	do {
-		tile -= delta;
-		if (!IsValidTile(tile)) return false;
-		height = GetTileZ(tile);
-	} while (z < height);
-
-	return z == height && IsTunnelTile(tile) && GetTunnelBridgeDirection(tile) == dir;
+	Tunnel *t = Tunnel::GetByTile(tile);
+	return t->tile_n == tile ? t->tile_s : t->tile_n;
 }
 
 /**
  * Is there a tunnel in the way in any direction?
  * @param tile the tile to search from.
  * @param z the 'z' to search on.
+ * @param chunnel_allowed True if chunnel mid-parts are allowed, used when terraforming.
  * @return true if and only if there is a tunnel.
  */
-bool IsTunnelInWay(TileIndex tile, int z)
+bool IsTunnelInWay(TileIndex tile, int z, bool chunnel_allowed)
 {
-	return IsTunnelInWayDir(tile, z, (TileX(tile) > (MapMaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) ||
-			IsTunnelInWayDir(tile, z, (TileY(tile) > (MapMaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE);
+	uint x = TileX(tile);
+	uint y = TileY(tile);
+
+	for(Tunnel *t : Tunnel::Iterate())  {
+		if (t->tile_n > tile || tile > t->tile_s) continue;
+
+		if (t->tile_s - t->tile_n > MapMaxX()){
+			if (TileX(t->tile_n) != x || (int)TileHeight(t->tile_n) != z) continue; // dir DIAGDIR_SE
+		} else {
+			if (TileY(t->tile_n) != y || (int)TileHeight(t->tile_n) != z) continue; // dir DIAGDIR_SW
+		}
+
+		if (t->is_chunnel && chunnel_allowed) {
+			/* Only if tunnel was build over water terraforming is allowed between portals. */
+			TileIndexDiff delta = GetTunnelBridgeDirection(t->tile_n) == DIAGDIR_SE ? TileOffsByDiagDir(DIAGDIR_SE) * 4 : 4;  // 4 tiles ramp.
+			if (tile < t->tile_n + delta || t->tile_s - delta < tile) return true;
+			continue;
+		}
+		return true;
+	}
+	return false;
 }
diff --git a/src/tunnel_map.h b/src/tunnel_map.h
index c347626d55..45589dacb4 100644
--- a/src/tunnel_map.h
+++ b/src/tunnel_map.h
@@ -13,6 +13,7 @@
 #include "rail_map.h"
 #include "road_map.h"
 
+typedef uint16 TunnelID; ///< Type for the unique identifier of tunnels.
 
 /**
  * Is this a tunnel (entrance)?
@@ -36,22 +37,34 @@ static inline bool IsTunnelTile(TileIndex t)
 	return IsTileType(t, MP_TUNNELBRIDGE) && IsTunnel(t);
 }
 
+/**
+ * Get the index of tunnel tile.
+ * @param t the tile
+ * @pre IsTunnelTile(t)
+ * @return TunnelID
+ */
+static inline TunnelID GetTunnelIndex(TileIndex t)
+{
+	assert(IsTunnelTile(t));
+	return _m[t].m2;
+}
+
 TileIndex GetOtherTunnelEnd(TileIndex);
-bool IsTunnelInWay(TileIndex, int z);
-bool IsTunnelInWayDir(TileIndex tile, int z, DiagDirection dir);
+bool IsTunnelInWay(TileIndex, int z, bool chunnel_allowed = false);
 
 /**
  * Makes a road tunnel entrance
  * @param t the entrance of the tunnel
  * @param o the owner of the entrance
+ * @param id the tunnel ID
  * @param d the direction facing out of the tunnel
  * @param r the road type used in the tunnel
  */
-static inline void MakeRoadTunnel(TileIndex t, Owner o, DiagDirection d, RoadType road_rt, RoadType tram_rt)
+static inline void MakeRoadTunnel(TileIndex t, Owner o, TunnelID id, DiagDirection d, RoadType road_rt, RoadType tram_rt)
 {
 	SetTileType(t, MP_TUNNELBRIDGE);
 	SetTileOwner(t, o);
-	_m[t].m2 = 0;
+	_m[t].m2 = id;
 	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = TRANSPORT_ROAD << 2 | d;
@@ -67,14 +80,15 @@ static inline void MakeRoadTunnel(TileIndex t, Owner o, DiagDirection d, RoadTyp
  * Makes a rail tunnel entrance
  * @param t the entrance of the tunnel
  * @param o the owner of the entrance
+ * @param id the tunnel ID
  * @param d the direction facing out of the tunnel
  * @param r the rail type used in the tunnel
  */
-static inline void MakeRailTunnel(TileIndex t, Owner o, DiagDirection d, RailType r)
+static inline void MakeRailTunnel(TileIndex t, Owner o, TunnelID id, DiagDirection d, RailType r)
 {
 	SetTileType(t, MP_TUNNELBRIDGE);
 	SetTileOwner(t, o);
-	_m[t].m2 = 0;
+	_m[t].m2 = id;
 	_m[t].m3 = 0;
 	_m[t].m4 = 0;
 	_m[t].m5 = TRANSPORT_RAIL << 2 | d;
diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
index 0423cde1f9..159f06f3fd 100644
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -40,12 +40,15 @@
 #include "water.h"
 #include "company_gui.h"
 #include "station_func.h"
+#include "station_map.h"
+#include "industry_map.h"
 
 #include "table/strings.h"
 #include "table/bridge_land.h"
 
 #include "safeguards.h"
 
+
 BridgeSpec _bridge[MAX_BRIDGES]; ///< The specification of all bridges.
 TileIndex _build_tunnel_endtile; ///< The end of a tunnel; as hidden return from the tunnel build command for GUI purposes.
 
@@ -649,12 +652,6 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1,
 	 * position, because of increased-cost-by-length: 'cost += cost >> 3' */
 
 	TileIndexDiff delta = TileOffsByDiagDir(direction);
-	DiagDirection tunnel_in_way_dir;
-	if (DiagDirToAxis(direction) == AXIS_Y) {
-		tunnel_in_way_dir = (TileX(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SW : DIAGDIR_NE;
-	} else {
-		tunnel_in_way_dir = (TileY(start_tile) < (MapMaxX() / 2)) ? DIAGDIR_SE : DIAGDIR_NW;
-	}
 
 	TileIndex end_tile = start_tile;
 
@@ -662,9 +659,15 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1,
 	int tiles_coef = 3;
 	/* Number of tiles from start of tunnel */
 	int tiles = 0;
+	/* flag for chunnels. */
+	bool is_chunnel = false;
+	/* Number of chunnel head tiles. */
+	int head_tiles = 0;
 	/* Number of tiles at which the cost increase coefficient per tile is halved */
 	int tiles_bump = 25;
 
+	TileIndex found_tunnel_tile = INVALID_TILE;
+
 	CommandCost cost(EXPENSES_CONSTRUCTION);
 	Slope end_tileh;
 	for (;;) {
@@ -672,13 +675,69 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1,
 		if (!IsValidTile(end_tile)) return_cmd_error(STR_ERROR_TUNNEL_THROUGH_MAP_BORDER);
 		end_tileh = GetTileSlope(end_tile, &end_z);
 
-		if (start_z == end_z) break;
+		if (start_z == end_z) {
+			_build_tunnel_endtile = found_tunnel_tile != INVALID_TILE ? found_tunnel_tile : end_tile;
+
+			/* Test if we are on a shore. */
+			if (end_z == 0 &&
+					(IsCoastTile(end_tile) ||
+					(IsValidTile(end_tile + delta) && HasTileWaterGround(end_tile + delta)) ||
+					(IsValidTile(end_tile + delta * 2) && HasTileWaterGround(end_tile + delta * 2)))) {
+				if (!is_chunnel) {
+					/*We are about to pass water for the first time so check if not to close to other tunnel */
+					if (tiles + 1 < head_tiles + 4 && found_tunnel_tile != INVALID_TILE) return_cmd_error(STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY_FOR_CHUNNEL);
+					if (tiles + 1 < 4) return_cmd_error(STR_ERROR_TUNNEL_RAMP_TOO_SHORT);
+				}
+			} else {/* We are leaving.*/
+				if (is_chunnel) {
+					/* Check if there is enough ramp space to come up. */
+					if (head_tiles < 4 && found_tunnel_tile != INVALID_TILE) return_cmd_error(STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY_FOR_CHUNNEL);
+					if (head_tiles < 4) return_cmd_error(STR_ERROR_TUNNEL_RAMP_TOO_SHORT);
+				} else {
+					if (found_tunnel_tile != INVALID_TILE) return_cmd_error(STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY);
+				}
+				break;
+			}
 
-		if (!_cheats.crossing_tunnels.value && IsTunnelInWayDir(end_tile, start_z, tunnel_in_way_dir)) {
-			return_cmd_error(STR_ERROR_ANOTHER_TUNNEL_IN_THE_WAY);
-		}
+			/* A shore was found so pass the water and find a proper shore tile that potentially
+			 * could have a tunnel portal behind. */
+			for (;;) {
+				if (!IsValidTile(end_tile)) return_cmd_error(STR_ERROR_TUNNEL_THROUGH_MAP_BORDER);
+
+				end_tileh = GetTileSlope(end_tile);
+				if(direction == DIAGDIR_NE && (end_tileh & SLOPE_NE) == SLOPE_NE) break;
+				if(direction == DIAGDIR_SE && (end_tileh & SLOPE_SE) == SLOPE_SE) break;
+				if(direction == DIAGDIR_SW && (end_tileh & SLOPE_SW) == SLOPE_SW) break;
+				if(direction == DIAGDIR_NW && (end_tileh & SLOPE_NW) == SLOPE_NW) break;
+
+				/* No drilling under oil rigs.*/
+				if ((IsTileType(end_tile, MP_STATION) && IsOilRig(end_tile)) ||
+						(IsTileType(end_tile, MP_INDUSTRY)                   &&
+						GetIndustryGfx(end_tile) >= GFX_OILRIG_1             &&
+						GetIndustryGfx(end_tile) <= GFX_OILRIG_5)) {
+					_build_tunnel_endtile = end_tile;
+					return_cmd_error(STR_ERROR_NO_DRILLING_ABOVE_CHUNNEL);
+				}
 
+				end_tile += delta;
+				tiles++;
+			}
+			/* The water was passed */
+			is_chunnel = true;
+			head_tiles = 0;
+			found_tunnel_tile = INVALID_TILE;
+		}
+		if (!_cheats.crossing_tunnels.value && IsTunnelInWay(end_tile, start_z, (tiles + 1 < 4 || (is_chunnel && head_tiles < 4) ? false : true))) {
+			if (found_tunnel_tile == INVALID_TILE || is_chunnel) { // Remember the first or the last when we pass a tunnel.
+				found_tunnel_tile = end_tile;
+				head_tiles = 0;
+			}
+		}
+		head_tiles++;
 		tiles++;
+	}
+	/* The cost of the digging. */
+	for (int i = tiles; i > 0; i--) {
 		if (tiles == tiles_bump) {
 			tiles_coef++;
 			tiles_bump *= 2;
@@ -746,21 +805,32 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1,
 		default: NOT_REACHED();
 	}
 
+	if (is_chunnel) cost.MultiplyCost(2);
+
 	if (flags & DC_EXEC) {
 		Company *c = Company::GetIfValid(company);
 		uint num_pieces = (tiles + 2) * TUNNELBRIDGE_TRACKBIT_FACTOR;
+
+		/* The most northern tile first. */
+		TileIndex tn = start_tile;
+		TileIndex ts = end_tile;
+		if(start_tile > end_tile) Swap(tn, ts);
+
+		if (!Tunnel::CanAllocateItem()) return_cmd_error(STR_ERROR_TUNNEL_TOO_MANY);
+		const Tunnel *t = new Tunnel(tn, ts, is_chunnel);
+
 		if (transport_type == TRANSPORT_RAIL) {
 			if (c != nullptr) c->infrastructure.rail[railtype] += num_pieces;
-			MakeRailTunnel(start_tile, company, direction,                 railtype);
-			MakeRailTunnel(end_tile,   company, ReverseDiagDir(direction), railtype);
+			MakeRailTunnel(start_tile, company, t->index, direction,                 railtype);
+			MakeRailTunnel(end_tile,   company, t->index, ReverseDiagDir(direction), railtype);
 			AddSideToSignalBuffer(start_tile, INVALID_DIAGDIR, company);
 			YapfNotifyTrackLayoutChange(start_tile, DiagDirToDiagTrack(direction));
 		} else {
 			if (c != nullptr) c->infrastructure.road[roadtype] += num_pieces * 2; // A full diagonal road has two road bits.
 			RoadType road_rt = RoadTypeIsRoad(roadtype) ? roadtype : INVALID_ROADTYPE;
 			RoadType tram_rt = RoadTypeIsTram(roadtype) ? roadtype : INVALID_ROADTYPE;
-			MakeRoadTunnel(start_tile, company, direction,                 road_rt, tram_rt);
-			MakeRoadTunnel(end_tile,   company, ReverseDiagDir(direction), road_rt, tram_rt);
+			MakeRoadTunnel(start_tile, company, t->index, direction,                 road_rt, tram_rt);
+			MakeRoadTunnel(end_tile,   company, t->index, ReverseDiagDir(direction), road_rt, tram_rt);
 		}
 		DirtyCompanyInfrastructureWindows(company);
 	}
@@ -850,6 +920,8 @@ static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
 		ChangeTownRating(t, RATING_TUNNEL_BRIDGE_DOWN_STEP, RATING_TUNNEL_BRIDGE_MINIMUM, flags);
 	}
 
+	const bool is_chunnel = Tunnel::GetByTile(tile)->is_chunnel;
+
 	uint len = GetTunnelBridgeLength(tile, endtile) + 2; // Don't forget the end tiles.
 
 	if (flags & DC_EXEC) {
@@ -870,6 +942,8 @@ static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
 				DirtyCompanyInfrastructureWindows(owner);
 			}
 
+			delete Tunnel::GetByTile(tile);
+
 			DoClearSquare(tile);
 			DoClearSquare(endtile);
 
@@ -886,11 +960,13 @@ static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
 			UpdateCompanyRoadInfrastructure(GetRoadTypeRoad(tile), GetRoadOwner(tile, RTT_ROAD), -(int)(len * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR));
 			UpdateCompanyRoadInfrastructure(GetRoadTypeTram(tile), GetRoadOwner(tile, RTT_TRAM), -(int)(len * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR));
 
+			delete Tunnel::GetByTile(tile);
+
 			DoClearSquare(tile);
 			DoClearSquare(endtile);
 		}
 	}
-	return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_TUNNEL] * len);
+	return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_TUNNEL] * len * (is_chunnel ? 2 : 1));
 }
 
 
@@ -1866,6 +1942,7 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
 				if (frame == _tunnel_visibility_frame[dir]) {
 					t->tile = tile;
 					t->track = TRACK_BIT_WORMHOLE;
+					if (Tunnel::GetByTile(tile)->is_chunnel) SetBit(t->gv_flags, GVF_CHUNNEL_BIT);
 					t->vehstatus |= VS_HIDDEN;
 					return VETSB_ENTERED_WORMHOLE;
 				}
@@ -1873,6 +1950,7 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
 
 			if (dir == ReverseDiagDir(vdir) && frame == TILE_SIZE - _tunnel_visibility_frame[dir] && z == 0) {
 				/* We're at the tunnel exit ?? */
+				if (t->tile != tile && GetOtherTunnelEnd(t->tile) != tile) return VETSB_CONTINUE; // In chunnel
 				t->tile = tile;
 				t->track = DiagDirToDiagTrackBits(vdir);
 				assert(t->track);
@@ -1889,6 +1967,7 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
 					assert(frame == rv->frame + 1);
 					rv->tile = tile;
 					rv->state = RVSB_WORMHOLE;
+					if (Tunnel::GetByTile(tile)->is_chunnel) SetBit(rv->gv_flags, GVF_CHUNNEL_BIT);
 					rv->vehstatus |= VS_HIDDEN;
 					return VETSB_ENTERED_WORMHOLE;
 				} else {
@@ -1898,6 +1977,7 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
 
 			/* We're at the tunnel exit ?? */
 			if (dir == ReverseDiagDir(vdir) && frame == TILE_SIZE - _tunnel_visibility_frame[dir] && z == 0) {
+				if (rv->tile != tile && GetOtherTunnelEnd(rv->tile) != tile) return VETSB_CONTINUE; // In chunnel
 				rv->tile = tile;
 				rv->state = DiagDirToDiagTrackdir(vdir);
 				rv->frame = frame;
@@ -1906,6 +1986,7 @@ static VehicleEnterTileStatus VehicleEnter_TunnelBridge(Vehicle *v, TileIndex ti
 			}
 		}
 	} else { // IsBridge(tile)
+		if (v->vehstatus & VS_HIDDEN) return VETSB_CONTINUE; // Building bridges between chunnel portals allowed.
 		if (v->type != VEH_SHIP) {
 			/* modify speed of vehicle */
 			uint16 spd = GetBridgeSpec(GetBridgeType(tile))->speed;
diff --git a/src/tunnelbridge_map.h b/src/tunnelbridge_map.h
index 62d3c14b2d..37e00457e4 100644
--- a/src/tunnelbridge_map.h
+++ b/src/tunnelbridge_map.h
@@ -11,7 +11,7 @@
 #define TUNNELBRIDGE_MAP_H
 
 #include "bridge_map.h"
-#include "tunnel_map.h"
+#include "tunnel_base.h"
 
 
 /**
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index e358421186..da107682f0 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -285,6 +285,14 @@ uint Vehicle::Crash(bool flooded)
 	return RandomRange(pass + 1); // Randomise deceased passengers.
 }
 
+bool Vehicle::IsDrawn() const
+{
+	return !(this->vehstatus & VS_HIDDEN) ||
+			(!IsTransparencySet(TO_TUNNELS) &&
+				((this->type == VEH_TRAIN && Train::From(this)->track == TRACK_BIT_WORMHOLE) ||
+				(this->type == VEH_ROAD && RoadVehicle::From(this)->state == RVSB_WORMHOLE)));
+}
+
 
 /**
  * Displays a "NewGrf Bug" error message for a engine, and pauses the game if not networking.
@@ -1082,7 +1090,7 @@ static void DoDrawVehicle(const Vehicle *v)
 	if (v->vehstatus & VS_DEFPAL) pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
 
 	/* Check whether the vehicle shall be transparent due to the game state */
-	bool shadowed = (v->vehstatus & VS_SHADOW) != 0;
+	bool shadowed = (v->vehstatus & (VS_SHADOW | VS_HIDDEN)) != 0;
 
 	if (v->type == VEH_EFFECT) {
 		/* Check whether the vehicle shall be transparent/invisible due to GUI settings.
@@ -1155,7 +1163,7 @@ void ViewportAddVehicles(DrawPixelInfo *dpi)
 
 			while (v != nullptr) {
 
-				if (!(v->vehstatus & VS_HIDDEN) &&
+				if (v->IsDrawn() &&
 						l <= v->coord.right &&
 						t <= v->coord.bottom &&
 						r >= v->coord.left &&
@@ -1209,7 +1217,7 @@ Vehicle *CheckClickOnVehicle(const Viewport *vp, int x, int y)
 	y = ScaleByZoom(y, vp->zoom) + vp->virtual_top;
 
 	for (Vehicle *v : Vehicle::Iterate()) {
-		if ((v->vehstatus & (VS_HIDDEN | VS_UNCLICKABLE)) == 0 &&
+		if (v->IsDrawn() && !(v->vehstatus & VS_UNCLICKABLE) &&
 				x >= v->coord.left && x <= v->coord.right &&
 				y >= v->coord.top && y <= v->coord.bottom) {
 
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 24facfb3e4..f3a964261c 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -363,6 +363,12 @@ public:
 
 	uint GetConsistTotalCapacity() const;
 
+	/**
+	 * Is this vehicle drawn?
+	 * @return true if it is drawn
+	 */
+	bool IsDrawn() const;
+
 	/**
 	 * Marks the vehicles to be redrawn and updates cached variables
 	 *
diff --git a/src/widgets/transparency_widget.h b/src/widgets/transparency_widget.h
index 2b096e733b..099d48a339 100644
--- a/src/widgets/transparency_widget.h
+++ b/src/widgets/transparency_widget.h
@@ -23,6 +23,7 @@ enum TransparencyToolbarWidgets {
 	WID_TT_STRUCTURES,               ///< Object structure transparency toggle button.
 	WID_TT_CATENARY,                 ///< Catenary transparency toggle button.
 	WID_TT_LOADING,                  ///< Loading indicators transparency toggle button.
+	WID_TT_TUNNELS,                  ///< Vehicles in tunnels toggle button.
 	WID_TT_END,                      ///< End of toggle buttons.
 
 	/* Panel with buttons for invisibility */