I hope this isn't to stupid a ?, but I have my new layout set up and tried to run a train but the engine/cars come off the track at the Atlas turn outs. If you look at the picture below, you can see where the regular rail ends (on the left) and there is a notch or step where the movable part of the turn out moves to when it is in the straight through mode. The wheel of the engine hits this notch and it's knocked off the track. All the engines and cars I have are 15-20 years old, has something changed in the wheel design that eliminates this problem?