Which is the busiest train station in Great Britain?

Waterloo is a London Underground station located within the Waterloo station complex that incorporates both the tube station and the main line railway station. It is the busiest station in Great Britain, with in excess of 99 million passenger entries and exits in 2014-2015. It is served by four lines: the Bakerloo, Jubilee, Northern and Waterloo & City lines.

The station is situated in fare zone 1 and is located near the South Bank of the River Thames, in the London Borough of Lambeth. It is within walking distance of the London Eye.

The first Underground Line at Waterloo was opened on 8 August 1898 by the Waterloo & City Railway (W&CR), a subsidiary of the owners of the main line station, the London and South Western Railway (L&SWR). The W&CR, nicknamed "The Drain", achieved in a limited way the L&SWR's original plan of taking its tracks the short distance north-east into the City of London.