OSM Page: http://wiki.openstreetmap.org/wiki/Map_Features#Railway

point values: station, halt, tram_stop, crossing [note: pedestrian], level_crossing [roads], subway_entrance, turntable, buffer_stop.

This layer also handles road/road crossing. Not sure what that is. Currently this layer is only handling level crossings.
RP: we may need to do some node merging here, to ensure the railway way and highway way intersect at a common point
we also may need some intelligence to get bridges automatically added in to which ever way goes over the top