 By the mid @-@ 1890s the station entrance had been incorporated into a larger building . In 1922 , a new entrance and canopy was designed for the Bridge Street entrance by Charles Holden and , in 1924 , he designed a plainly rendered replacement elevation for the eastern entrance on to the Embankment . These were the first of many projects by the architect for the London Electric Railway ( the main forerunner of London Transport and Transport for London ) . The station platforms were also refurbished with new wall tiling in the green , blue , black and white tiling scheme used later by Holden on many stations of the period and still visible at neighbouring St James 's Park station . In 1949 , the Metropolitan line @-@ operated Inner Circle route was given its own identity on the tube map as the Circle line . 
