Codechange: Use enum class for RailTileType

src/road.cpp

@@ -45,7 +45,7 @@ RoadType RoadTypeInfo::Index() const
 static bool IsPossibleCrossing(const TileIndex tile, Axis ax)
 {
 	return (IsTileType(tile, MP_RAILWAY) &&
-		GetRailTileType(tile) == RAIL_TILE_NORMAL &&
+		GetRailTileType(tile) == RailTileType::Normal &&
 		GetTrackBits(tile) == (ax == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) &&
 		std::get<0>(GetFoundationSlope(tile)) == SLOPE_FLAT);
 }