Well, I wasn't sure I was going to couple them together. It would make it easier to lift off of the shelf if they were not coupled. So, I just thought a 1" x 2" at each end would at least keep the last car or two from moving. My biggest concern is not people hitting it, but our dogs. This is in our media room. It's a dual track shelf layout about a foot from the ceiling. I am planning on putting the shelves on one of the "long" walls (room is 18' x 25'), but I already have artwork hanging and sconces on the walls. So, the shelves were going to be roughly 14' long to accommodate the cars. If one of our three labs brushes up against one, even in the middle, then, without some sort of end stops, I think they may go flying off of the end. They may come off the front anyway, but I am hoping that that does not happen. I think I will just run the boards across my table saw and cut a double 1/8" groove in each, wide enough for the flanges to drop into, but not wide or deep enough for the entire wheel to fit into. Just wondering how others solved this issue when longer trains were involved. Appreciate the responses.
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