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@ -259,13 +259,14 @@ int32 CmdTerraformLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
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if (IsSteepSlope(s)) return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
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if (IsPlainRailTile(tile)) {
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/* We need to check if a rail is on a leveled foundation and
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* then treat it as such. Important for correct tunneling */
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/* If a piece of rail is on a foundation, prohibit any terraforming
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* of that tile. We do need to check this with the original slope, not
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* the would-be one. */
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extern const TrackBits _valid_tileh_slopes[2][15];
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TrackBits tb = GetTrackBits(tile);
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uint foundation = (GetRailFoundation(s, tb) == 0) ? 1 : 0;
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if (tb & ~_valid_tileh_slopes[foundation][s]) return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
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if (GetRailFoundation(GetTileSlope(tile, NULL), tb) != 0) return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
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if (tb & ~_valid_tileh_slopes[0][s]) return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
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} else return_cmd_error(STR_5800_OBJECT_IN_THE_WAY);
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}
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