On3?

I built this turntable using a stepper motor bearing from a laser printer. The curved tracks going behind the roundhouse were going to be a doubletrack helix to a lower level.

Now that I don't have to build a fleet of 2-8-0 locos....I've been thinking about resurrecting that layout lately, even though that yard has been dismantled. It was a good design and flowed well. The tracks leading to the left are part of a double ended section about 6 feet long. The tower controlled the entrance to the yard and the helix. I was going to build a bank of hand thrown levers, mounted on the fascia...