Codechange: Store the rail type of rail engines as a RailTypes bitmask.

src/vehicle.cpp

@@ -2837,7 +2837,7 @@ void Vehicle::ShowVisualEffect() const
 				IsDepotTile(v->tile) ||
 				IsTunnelTile(v->tile) ||
 				(v->type == VEH_TRAIN &&
-				!HasPowerOnRail(Train::From(v)->railtype, GetTileRailType(v->tile)))) {
+				!HasPowerOnRail(Train::From(v)->railtypes, GetTileRailType(v->tile)))) {
 			continue;
 		}