I had never seen one of these before today. They’re great. Way better than reaching for a single pole in a crowded car and wrapping your hand around some stranger’s fingers. And If you have the whole thing to yourself you can hook your arm through it.
Neat, I like it.
Looks kinda expensive to fabricate (relative to a plain pole), though. I’d probably value-engineer it out if I were designing the train car, TBH.