text: in know this rails quite well. there are about six trains a day. because there is on every crossing with another street/way a level crossing, it is everywhere routable correctly. there should also not be a false impression that it is only crossable on the levelcrossings, because on other points there are no footways on the map that one could like to take to cross the rails...
  and at the moment there is unfortunately no other way to tag this in openstreetmap. therefore i close this note.