Batteries... I had a friend years ago in Mass. He ran the "Keystone Canyon", 'O' Gauge, outside third rail, powered by huge batteries that I believe were submarine batteries. His name was Phil Bridges, and he goes way back. A good friend of Frank Ellison's, even ran Delta Line engines and rolling stock. Now, this would have been DC, right? I have many pics, even showing much younger me running the railroad. I don't recall the pics showing under the layout and the batteries, but I'll look more carefully. The amount of work Phil did blew my mind...the transitions across turnouts were as smooth as silk. We were running before 1950.