DCC and DCC-Bitswitch Collision Avoidance System.
Two trains have to travel on the same 250 foot length of track in a figure 8 configuration, the whole display is elevated 10 feet above the ground.
Problems to over come:
1. Long bridge is not wide enough for both trains to pass each other at the same time.
2. Trains must not T-Bone on the 90 degree crossing.
3. Trains must run unattended for 13-15 hours a day.
Video starts out showing the Yellow Train going through the crossing, after it clears the crossing the Red train (pan to Red Train) will start up and proceed across the single lane bridge. Pan back to Yellow Train and you will see the Yellow train will slow down, it is waiting for the Red Train to clear the bridges letting the Yellow Train to proceed through the crossing, then proceed to the main on the siding and stop. You will notice the Red Train has not returned across the bridge yet so the Yellow train cannot move yet. The Red Train finally clears the bridge and continues toward the crossing, it does not get a stop signal so it continues through the crossing. after the Red Train clears the crossing, (Pan to Yellow Train) the waiting Yellow Train will start up to cross the bridge. This operation repeats all day long.
If either train does not make it back to the siding on the main, the other train returning from the bridge will stop before the crossing and wait until the other train gets to the Siding.
See for yourself.