Almost all the steam and diesel power in my Run Room is MTH. The performance of the MTH engines with Proto-Scale 3-2T 3-Rail/2-Rail Conversion capibilities is unacceptable and I won't be buying those engines.
Even some of the straight 3 rail engines will stall on a Ross #8 switch(a thing of beauty) without special wiring as alluded to. However I certainly agree you.
We're not buying anymore either. Why would you put wipers on a 3 rail engine to pick up the common, Rail-king seems a better deal to me.
I don't think turning a set of wheels around in the tender would help much??
I don't have a engine and continuity meter handy.