Bob, there are no 2rail switches made that will work with 3rail wheels.
That's not quite true. Atlas 2 rail Code 148 switches will work with 3 rail wheels, you just have to reposition the guard rails.
I've posted pictures and videos in the past. I also gave a detailed explanation how I came to use Atlas turnouts. The key to finding a turnout that will work is having one with a cast frog. 3 rail wheels will clear the Atlas frogs with no modifications. I have modified both #7.5's and #5's. Unfortunately I'll be tearing down the work shortly.
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Bob Delbridge - Im sorry I didn't reply to your post of a few days ago. I'm in the middle of a move to another town and didn't catch your post. If you have questions, email me and I will reply with all I have learned. Thanks
My reason for asking is I'm in the process of converting all my 3-rail steamers to Battery-Power Remote Control and have removed the middle "training wheels" on the engines, but kept the big flanges on the drivers and trucks. I no longer need the middle rail.
That would make the conversion of Atlas turnouts much easier. All you would have to do is reposition the guard rails.
Converting them to 3 rail required replacing some of the ties with PC board ties and soldering in the 3rd rail, etc.