SAN FRANCISCO — A new skateboard that can be used on cable car rails is going viral online, but San Francisco Municipal Transportation Agency officials say it is dangerous and they will prosecute anyone who tries to use one. Ricardo Marques, …
http://trn.trains.com/news/news-wire/2017/05/17-new-skateboard-raises-eyebrows-in-san-francisco
Call it “The Darwin”
I would bet that the inventor (?) never considered the possibility that his toy might get stuck in the slot and couldn’t release from the cable.
That would be a safe bet because the toy doesn’t go anywhere near the slot. Actually watching the video with even marginal knowledge of skateboarding will reveal that the board’s wheels are shaped to run in the flange clearance of girder rail.
Note the carefully-implemented brake arrangement.