I have a set of PRR Century Club Sharks where both A units are powered. One of the units starts up in forward and the other starts in reverse. I programmed them both with the same number and they run fine. Try setting up your ABA set all with number 1. If the A units start up in the correct directions (one forward one reverse) you will be in business until Lionel can reprogram your engines.
Thank you! I will try setting them up like that this afternoon.