I have 8 LL GP-20's and they will run with the best Atlas of which I have several including the new GP-38's, and I only paid $14.99 to $17.99 each at Model Expo. The coupler is a snap to change to MT's, or you can make a transition car, A Rapido on one end and an MT on the other, I made 4 such cars as I have about 50 Bachmann freight cars and I don't want to spend the money to change the couplers, and I have about 50 MT cars, with the transition cars I can mix them up in a consist with out a problem. I have about 30 other LL engines and had a problem with only one of them, returned it to LL and they sent me a new one within 10 days. I have been very satisfied with their products. And the little SW1200 is probably one of the best switchers on the market.