From Auran's Content Creation Art Source:
The in-game crossing rebuilt into UMxing-U3t35.
UM = U Make your own crossing with your favorite lights, signs, fences, etc.
U = For use with in-game USA, UK and similar roads.
3t = 3 track.
35 = 3.5m track-spacing.
Surveyor: Objectmode-NL-Trackside.