@Jim 1939 posted:It doesn't really matter. The RR used what was available to fit the load. Me I would always choose an AA first.
I concur… the NYC ran them both ways, and so do I. If I’m up for a quick run, Lionel F3As it is as they’re both in the same box. With that said, my Atlas F2A gets a B, as does the Lionel F7A.
thanks!
- Mario