Dave,
Ok I added another Ser 2 into the equation. Below is the "Revised Diagram" . I still can't get the water tower or other accessories to work after assigning them a "push button" on my I pad.
I can only get my Cab 1 remote to allow power to the track with this configuration. What exactly is happening is when I hit the push button on the I pad, all Ser2's light up (red LED briefly), but the OSC and the ASC do not light. Do I need to add a wire? Thanks for your help and patience.