Which London train station is the only one to have entrances on both sides of the Thames?

Blackfriars, also known as London Blackfriars, is a central London railway station and connected London Underground station located in the City of London. Its platforms span the River Thames, occupying the length of Blackfriars Railway Bridge, a short distance downstream from Blackfriars Bridge. Since 2011 there have been station buildings, with passenger entrances, on both sides of the river; the north bank entrance is on the south side of Queen Victoria Street and the south bank entrance, opened in 2011, is adjacent to Blackfriars Road. It is the only London station to span the Thames, with entrances on both banks.

The main line station was opened by the London, Chatham and Dover Railway company with the name St. Paul's in 1886. The Underground station opened in 1870 with the arrival of the Metropolitan District Railway. The station was renamed Blackfriars in 1937. National Rail services are now provided by Southeastern and Thameslink while the Underground station is now served by both the District line and, since 1949, the Circle line.