I purchased a beautiful River Raisin S scale Flying Yankee. I am considering converting from scale to Hi-rail. My home layout is American Flyer tubular track, but most curves are the K-line 27" radius.
I have spoken to one of the gentlemen who ran River Raisin and learned that no parts were ever available to make this conversion.
I have also read an older thread from a poster who considered converting a River Raisin brass milk car, but decided not to do it.
I am thinking NWSL for wheel sets. once I can figure out the proper size wheels and axles.