Unfortunately I learned of this after my layout is already together. I guess you should have ONE of these two features on either your track or train wheels... Turnouts: The triangle point in the middle, basically where the two tracks split down the middle... Needs to be long and sharp in order for the wheels to catch it before falling into the ditch. I dont have long pointy tips on my atlas turnouts. Another way is to have a bigger radius of the inner part of the wheel (inside the track, not ontop part) so that it rides the bottom of the turnout and not falls down. Unfortunately, I dont have either so everything I go across the switchtracks my trains clink... Anyways back to my question... Are there any good brands of rollingstock/DCC equipped locos that have bigger radius wheels to ride the bottom? I was too lazy to post a picture, if you dont understand ask and ill show you.