I've used one myself (hand operated), and actually that's the only one I've seen in my life I don't know about how common they are in the US, though. However, Muldraugh has a nice and big trainyard which now is almost empty. Maybe there is a chance that one of those could be sitting there somewhere in the future? Thats interesting it would be fun to use one of those things. I read your other link didn't know what they where called, thanks for sharing.