To reverse a loco, it only needs to turn 180°. Is the B&O Mus. example the only one that existed in prototype, no short line, mining road, logging example known? And has anybody ordered or built one of these three brands discussed...or ? commercial brand detailed to look like it is armstrong or a gallows turntable I have a couple of gallows turntable kits from out of the past, but they look very flimsy for operation, even manual, much less powered. I have seen prototype photos of very short turntables turning Alaskan rail "critter", and streetcars, but doubt if anyone has built a powered model.