Tom,
Which engine always starts in reverse? Based on the info you provided only the non powered A unit 4021 should be set up by Lionel to start up in reverse and since it is a dummy this is only for lighting and the remote rear coupler working correctly when running them in a AA set (back to back). If you want two powered A units as the AA set you would have to run them as a MU or the unspoken word Lash Up. Here both engine 4020 and 4022 would be set up in Legacy as separate engines. If you put 4020 as the lead unit with 4022 coupled back to back you would need to charge the direction of 4022 so it starts up in reverse in the lash up. If you want all 3 engines in the lash up each needs to be set up as engines #s 20, 21 and 22, Then you can build your lash up with engine 20 leading starting forward with engine 21 facing backwards and engine 22 also facing backwards. Use the pictures on the screen when changing you engines directions for engines 21 and 22 starting up in reverse. Hope this helps.
JohnB
