I have a couple of different Lionel Sharknose units, 2 A units (I believe they're the Legacy set 6-34701 based on the units #s 2020, 2021, no boxes or instructions when I received them), and a Century Club B unit, 6-24510 (have the original box, but no instructions). I don't have any other Legacy equipment, so they'll run under TMCC.
I was wondering what would need to be done to run them as an A-B-A set. I know only one of the A units is powered, but believe the B unit has sound. Should each unit get its own ID #, or should they all get the same # (and is that even possible)? Any other tips or advice?