This controller alternately runs two trains in opposite directions on a single track loop with a passing siding. www.azatrax.com/auto-loop-controller.html This type of exhibit layout or museum display can be used to demonstrate railroad freight operations. One train takes loaded open cars, like hoppers or gondolas, from Industry A to industry B. Another train then returns similar empty cars from B to A. The passing siding is typically hidden behind the backdrop. The circuit has non-volatile memory, so operations continue where they left off if power is interrupted. DC two-rail track power only. Peasey
