Yes, you read that right. Actually, it was more of an amusement park ride than serious public transport, but it did exist.
I’ve seen a model of that thing at a heritage railway in the U.K, can’t recall which one. Those limeys have a whimsical streak, don’t they?
I imagine that you’re not the only one who follows Jago Hazzard on You Tube- he puts out some great information the London Underground and other items of interest.