Thanx for finding that old "flick" and posting it, Bill. I can recall the old Milwaukee Union Terminal (MUT) built in a former RR station in the beer city. Until somewhere around that time, it, too, was operated on outside 3rd rail. For power they had a bank of automotive storage batteries withe some rectifier re-chargers. There was so much amperage available that it could have welded the trains to the tracks! And, of course, Frank Ellison's great layout employed an outside 3rd power rail.
Neat stuff to watch, now, although the motors, controls, power systems and all are so much improved over those "good old days."
Paul Fischer