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-rw-r--r--src/rail_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index be8e871ed..15f80502e 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -192,7 +192,7 @@ uint GetRailFoundation(Slope tileh, TrackBits bits)
static uint32 CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
{
if (IsSteepSlope(tileh)) {
- if (existing == 0) {
+ if (_patches.build_on_slopes && existing == 0) {
TrackBits valid = TRACK_BIT_CROSS | (HASBIT(1 << SLOPE_STEEP_W | 1 << SLOPE_STEEP_E, tileh) ? TRACK_BIT_VERT : TRACK_BIT_HORZ);
if (valid & rail_bits) return _price.terraform;
}