Tubeman here... A clue's in the name; I work on London Underground... 14 years this year, Northern Line Guard (R.I.P.), Northern Line 'Motorman', District Line Driver, Duty Manager at Earl's Court, Train Operations Manager then Group Station Manager on the Bakerloo Line, now working at Head Office.
Look out for me on series 1 of 'The Tube' (ITV) too, in my earl's Court Duty Manager days
I'm also the 'author' (I guess more cartographer) of the 'London Railway Atlas' (Ian Allan), so like to think of myself as an authority on London's railway history.