What I was able to find out about the PowerMax is that it is a Lionel transformer; therefore, you probably need to ask this question over on the Classic Toy Trains forum which is for Lionel owners more so than this area.
Hello- I'm new to this form. I hope I'm in the right place. I have a PowerMax transformer and we hooked it up today and the train engine will run forward but not backward. Also the Whistle will not blow??? Any suggestions?