You can make railroad crossings in RCT3 with the lower land place path and raise land trick to intersect path and track, and use crossing covers to hide the ties. That's for the default RCT3 track. There is a railroad crossing signal set based on US crossings as well. And a sound set of whistles and crossing bells that is triggered as a ride event. If using the trains with DasMatze's track then the path trick isn't even needed, because there's no collision detection. But, you could raise the path slightly to hide the ties and ballast at the crossing. I hope Planet Coaster lets you make railroad crossings with path. It would be a shame if you couldn't. A lot of park railroads have crossings with signals and sometimes gates.