Mannyrock,
1) Welcome to the OGR Forum!
2) When starting a new topic, it's helpful to give a short intro on the background as to what you are trying to do. I read your question and was wondering what you were trying to do (I had not seen your earlier posts from a few days ago). It's impossible for everyone to read every thread that shows up on the board, so not all know the content of your previous discussions. ( I was wondering why you were converting an AC transformer to DC to run AC trains (especially because you mention connecting the transformer to the track) before I saw Mike CT's reply and realized what you were doing)
3) For a turntable, yes, what has been described with a simple DPDT switch is the answer. Depending on how you want to turn the power on or off, the "center off" type of DPDT switch Mike CT mentions is needed. Otherwise if you buy one that is not "center off", you would have to remove the power via the transformer itself to stop the turntable from rotating (and you say it has no adjustable control, just terminals , so you would have to unplug it - not the way to go).
Good luck with your project.
-Dave
