Re: 1,097m (3,599ft)
"You could go up to the Jungfraujoch on a train if you want steep cog railways, to a height of 3454m, but we aren't in Switzerland either."
There is another underground station at a similar height, above the resort of Saas Fee. It is at the top of the underground funicular Metro Alpin. The Mittelallalin station claims to be 3,456m and also featured a London Transport Underground station name sign when I was there decades ago.