@Hudson, great point! I thought you could "re-tool" the standard MTH offerings for 2-rail but, don't know anyone who has done so successfully. It makes good sense.
The reason I reached out to Joe @ Baldwin is because I am getting the new MTH R-142 subway set which only comes in a 3-rail version but, obviously I would need to get it to 2-rail. I have never attempted a conversion myself and am very hesitant to to start out on a brand new set with PS 3 in it.
I wonder how difficult it is. If not too crazy it opens up a whole world of possibilities, though many of those vehicles are not "scale", I'd rather have them running than nothing at all.