John,
I just tried a wallwart that has different voltage settings of 1.3, 3. 4.5, 6, 7.5, 9, and 12 vdc and is rated at 300ma. I tried it at 12, 9, and 7.5 and so far it works fine. Still need to power the tracks and get the leads into the TT shimmed down to match the track on the TT.
