MTH FA A-B-A locos

AA or AB should work, as long as the A is not the slave unit.

Not exactly sure where the second smoke unit is.

tony

The lead A unit has a PS2 3v board, the B unit has a pass through tether and the trailing A has a slave board.  The set can be operated as A, AB, AA or ABA in DCS or conventional.  Since the trailing A has a slave board, you do not need to do a lash-up with your DCS hand-held.  Commands to operate the slave board are transmitted through the tether from the PS2 3v board.  Both A units have a smoke unit which are controlled by the potentiometer on the lead A unit.

Thanks so much for your information.  I had a chance to inspect the units and could see the B was empty when looking through the screens.  Boy do they put out smoke.  Tomorrow I will lube them and turn the smoke down.  What a neat set of diesels!!!!

Looks like Jon G answered your questions. I just wanted to chime in and concur that yes indeed, this is a nice set of locomotives.  I acquired the same in (the fine looking) Canadian Pacific livery several years ago and besides the awesome smoke output, they have tremendous pulling power.  I'm sure you will enjoy this set.