My F7 A A Units are both powered. My B units are a dummy and a sound  car.
So I still need to under stand how to run the AA units together.

I am a Lionel operator that hasn't run multiple operating units. I found Williams F7 AA & BB units and wanted to run them. I put on the track to run. I wasn't able to get them working together to go in the same direction. Can someone help me understand how to set up my units to do this?