Fairmont, Motor Car, Model M-19. I've always been slightly amused when (mostly railfans) use the term "track speeder".
No harm meant, but if you came onto NS during the days of "motor cars" and called one a "track speeder", you'd get a funny look or a "Whu----------?" Its just the difference in locale and slightly different terminology amongst the railroads. We never heard that term.
In the last days of the "motor car" on NS, I must have loaded a couple hundred of them onto trailers, flatbeds----even loaded several into a horse trailer. Some of them went to other railroads, a bunch to private individuals. I asked one fellow what would he DO with an old motor car, he told me he wanted to put it out on the track and run up and down. He left me the inpression that he just might put his on the main line and get KILLED!
I had the shop superintendent make SURE he understood that you could NOT put them out on a mainline RR and "play" with them!