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@ -522,6 +522,15 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32
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/* slope of end tile must be complementary to the slope of the start tile */
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/* slope of end tile must be complementary to the slope of the start tile */
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if (end_tileh != ComplementSlope(start_tileh)) {
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if (end_tileh != ComplementSlope(start_tileh)) {
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/* Some (rail) track bits might be terraformed into the correct direction,
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* but that would still leave tracks on foundation. Therefor excavation will
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* always fail for rail tiles. On the other hand, for road tiles it might
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* succeed when there is only one road bit on the tile, but then that road
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* bit is removed leaving a clear tile.
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* This therefor preserves the behaviour that half road tiles are always removable.
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*/
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if (IsTileType(end_tile, MP_RAILWAY)) return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
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ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
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ret = DoCommand(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);
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if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
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if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);
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} else {
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} else {
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