What were the normal lashups for this train? I'm pretty sure an ABBA of F-7's was probably the most common , but what about an ABBA of F-3's or even ABBBA of F-3's? There are no F-7 B's available anywhere as far as I could tell. Looking for a Christmas gift for myself,(the complete train(Kato), and I don't care if it has ABBA or ABBBA of F-3's as long as the prototype did it. Thanks Super Chief fans.