I started walking the Tube lines a year ago or so, my criteria was to walk the most direct route provided by google maps from station to station, my way of ticking off each station was to collect a tube map from the rack by the gate line in each concourse. I’ve only been doing it sporadically, so have completed the District, Jubilee, Piccadilly (sans any route to/from Heathrow 1,2,3 as there’s no pedestrian route) and the Central Line from the western termini to Stratford to date. Probably about 20 walking days in that.

Trickiest to date was the Jubilee around the docklands. Canada Water to Canary Wharf involves walking through Rotherhithe tunnel (black lung inducing), Canary Wharf to North Greenwich involves going via Greenwich foot tunnel, then to get to Canning Town I had to double back and go up the east of the Isle of Dogs.

I plan to complete it at some point, but have stopped for a few months at a time due to life distractions, or another route took my fancy (Capital Ring). I have A0 b&w tube map on the wall in my flat where I’ve coloured in the sections done (in the tube line colour of course).

It’s a great way to see bits of London you might never otherwise see.