Merge branch 'master' into jgrpp

# Conflicts:
#	src/gfxinit.cpp
#	src/saveload/saveload.cpp

src/rail_cmd.cpp

@@ -1786,7 +1786,7 @@ CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint3
 		 * Tunnels and bridges have special check later */
 		if (tt != MP_TUNNELBRIDGE) {
 			if (!IsCompatibleRail(type, totype)) {
-				CommandCost ret = EnsureNoVehicleOnGround(tile);
+				CommandCost ret = IsPlainRailTile(tile) ? EnsureNoTrainOnTrackBits(tile, GetTrackBits(tile)) : EnsureNoVehicleOnGround(tile);
 				if (ret.Failed()) {
 					error = ret;
 					continue;