User blog comment:Stormwell/Thoughts on Technology/@comment-1500935-20140210135550/@comment-1500935-20140213194613

Ah, you're talking about poles here like on batteries? So yes in a way that's true, though it's more a popularization of how electric circuits work.

Yes, track systems with three rails do exist, but then adding a fourth rail was maybe to compensate the huge amount of energy such transports probably need. Still, it's completely unsafe as anyone can get shocked by the rails.

Now that the two different set of tracks was to help maneuver? That's a possibility which can't be excluded I guess.