On Sunday, April 7, 2013 9:56:37 AM UTC+1, Sampo Smolander wrote:
http://traintimes.org.uk/map/tube/

There appear to be 2 secret lines in South London that are about 1 mile to the east & west of the Northern Line, with trains running at several hundred miles an hour between approx Kingsway and Merton. Can anyone tell me how I can get a ride, because I am sure it would be very exciting?