I have the Wabash PWC set and it is a beauty. Looks great, sounds great and runs as smooth as silk with double pullmor power.
I think you set the powered A unit and the B unit with sound as the same engine number, then the add on A unit as another engine number, then build a train in usual fashion. Should run like champ. It sounds like one of the motors is binding on something. I would open it up and have a look.
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