diff options
Diffstat (limited to 'src/rail_cmd.cpp')
| -rw-r--r-- | src/rail_cmd.cpp | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp index 88112966d..992eddd25 100644 --- a/src/rail_cmd.cpp +++ b/src/rail_cmd.cpp @@ -355,11 +355,16 @@ CommandCost CmdBuildSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p cost.AddCost(ret); /* If the rail types don't match, try to convert only if engines of + * the new rail type are not powered on the present rail type and engines of * the present rail type are powered on the new rail type. */ - if (GetRailType(tile) != railtype && HasPowerOnRail(GetRailType(tile), railtype)) { - ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL); - if (CmdFailed(ret)) return ret; - cost.AddCost(ret); + if (GetRailType(tile) != railtype && !HasPowerOnRail(railtype, GetRailType(tile))) { + if (HasPowerOnRail(GetRailType(tile), railtype)) { + ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL); + if (CmdFailed(ret)) return ret; + cost.AddCost(ret); + } else { + return CMD_ERROR; + } } if (flags & DC_EXEC) { |