Is it possible to run my Bachmann Big Hauler on Lionel G scale track? What are the differences between the two?
Yes, it is possible. Lionel brass track is tubular brass - pretty much the cheapest brass track there is. Do enough prying and poking, and it can, with difficulty, be mated to Bachmann track.
More through accident than anything else, I have aquired piles of Lionel Large Scale brass track. I use it mostly for 'dead' sidings - places where cars get parked, but loco's seldom go. (Rest of the layout is Aristocraft and LGB)