In this Video you can see the automated crossing lights on a friends layout (thanks Rod).
Train run in either direction on either track. These controllers are available in single track or double track or combined for more tracks. The most they have been used for to date is a 4 track crossing.

SimplyRail is a micro manufacturer as a part of my hobby. I enjoy creating electronic control devices for Model Railways. These are avalible to purchase from wwwsimplyrail.com.au I am located in Victroia Australia.