I just got my Model Power Santa Fe Continental Express set today. The locomotive and the cars look great and run well. (Although the loco could use traction tires) It's a good start into N scale that's really giving me the bug to go further. I also won a Bachmann U36-B locomotive on eBay. This engine also runs well. (And has traction tires) The problem I'm having is that the engines run in seperate directions. I had the U36 on the track first and had to reverse my wires because it started out going backwards. Then I put the Santa Fe set on the track and I had to reverse the wires again because it started running backwards. No mater which way I put the wires, one unit or the other wants to go backwards. How messed up is this? The only solution I can think of is that the U36 is a "B" unit and was made to run backwards behind a forwards running "A" unit???