How does bachmann's "Big Train" Mogul operate? I just took it apart and discovered that It had electrical pickups (track power) and was also told it can run on "D" batteries. Which one is it? How well do they run? I was planning on rusting it up for a static display, would that be a waste, or do they work so poorly (Am familar of poor quality of HO/N standard products by bachmann) that it would be justified to do so to this engine? how much, (if any) cars can it pull up and down a gentle grade?