London has a river running through it, and the tube runs under the river. It doesn't take long to spot some numbers floating in the river -
|Wapping to Rotherhithe, 4900 steps; Island Gardens to Cutty Sark, 1200 steps|
Another little quibble is that some of the linked stations could do with having step counts for the transfers between lines. Has anyone counted the number of steps at Green Park to get from Jubilee Line to Victoria Line - or at Waterloo to get from Jubilee Line to Bakerloo Line?
*It's not really a map, it's not to scale - it's a diagram.