List of London railway stations - Based on 2013-2014 Total passenger entry and exit statistics

Reference 1: Yearly passengers.

Reference 2: Waterloo, Victoria, Liverpool Street, London Bridge, Euston, Charing Cross, Paddington, King's Cross, Stratford, St. Pancras, Clapham Junction, East Croydon, Cannon Street, Vauxhall, Wimbledon, Fenchurch Street, Highbury Islington, Marylebone, Blackfriars, Putney, Richmond, Surbiton, Moorgate, Lewisham and Barking.

Source: http://en.wikipedia.org/wiki/List_of_London_railway_stations