@rdunniii posted:FMs have been discussed a couple of times in the past. They just never get much interest.
As I mentioned in an earlier post, a FM H20-44 road switcher (with the Loewy features) would be on my very short buy list. These came out in 1947, three years earlier than the H12 or H16. While only 5 roads had them, three of the big ones did: UP, NYC, and PRR. Seems like there would be a market for them.