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-rw-r--r--src/rail.h18
-rw-r--r--src/rail_cmd.cpp6
2 files changed, 22 insertions, 2 deletions
diff --git a/src/rail.h b/src/rail.h
index 3f401cd37..f0a5ef609 100644
--- a/src/rail.h
+++ b/src/rail.h
@@ -270,6 +270,22 @@ static inline Money RailBuildCost(RailType railtype)
}
/**
+ * Returns the 'cost' of clearing the specified railtype.
+ * @param railtype The railtype being removed.
+ * @return The cost.
+ */
+static inline Money RailClearCost(RailType railtype)
+{
+ /* Clearing rail in fact earns money, but if the build cost is set
+ * very low then a loophole exists where money can be made.
+ * In this case we limit the removal earnings to 3/4s of the build
+ * cost.
+ */
+ assert(railtype < RAILTYPE_END);
+ return max(_price[PR_CLEAR_RAIL], -RailBuildCost(railtype) * 3 / 4);
+}
+
+/**
* Calculates the cost of rail conversion
* @param from The railtype we are converting from
* @param to The railtype we are converting to
@@ -296,7 +312,7 @@ static inline Money RailConvertCost(RailType from, RailType to)
}
/* make the price the same as remove + build new type */
- return RailBuildCost(to) + _price[PR_CLEAR_RAIL];
+ return RailBuildCost(to) + RailClearCost(from);
}
void DrawTrainDepotSprite(int x, int y, int image, RailType railtype);
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index f0b79a070..7440f86ac 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -503,7 +503,7 @@ CommandCost CmdBuildSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, u
CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
Track track = (Track)p2;
- CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_RAIL] );
+ CommandCost cost(EXPENSES_CONSTRUCTION);
bool crossing = false;
if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
@@ -533,6 +533,8 @@ CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1,
if (ret.Failed()) return ret;
}
+ cost.AddCost(RailClearCost(GetRailType(tile)));
+
if (flags & DC_EXEC) {
if (HasReservedTracks(tile, trackbit)) {
v = GetTrainForReservation(tile, track);
@@ -563,6 +565,8 @@ CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1,
if ((present & trackbit) == 0) return CMD_ERROR;
if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
+ cost.AddCost(RailClearCost(GetRailType(tile)));
+
/* Charge extra to remove signals on the track, if they are there */
if (HasSignalOnTrack(tile, track))
cost.AddCost(DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS));