Hello and thanks for any help. At christmas time I have an elevated area in my home that I wanted to put and HO scale Xmas train on. The problem is the architecture. It has at one end a square about 4' by 4'.., easy for a circle with a tree in the middle.., However it has a 20' "L" shaped ridge coming off of it around to our front door. What I would like to do is create a path around an oval onto a straight track around the L and back to the Oval. Unfortunately the "L" is only about 18" wide, I can't turn the train around at the opposite end of the "L". Are there model train types that travel forward one way on a straight track, reach the end, automatically switch to reverse and go backwards along the same track until they reach the end again and then switch to forward?? I know I would probably have to invest in a different type of train but it would be an excellent addition to my G Scale that travels around the downstairs area of our house during Xmas.