Tower Bridge as its northern landfall is in Tower Hamlets. The bridge consists of two bridge towers tied together at the upper level by two horizontal walkways, designed to withstand the horizontal tension forces exerted by the suspended sections of the bridge on the landward sides of the towers. The vertical components of the forces in the suspended sections and the vertical reactions of the two walkways are carried by the two robust towers. The bascule pivots and operating machinery are housed in the base of each tower. Before its restoration in the 2010s, the bridge's colour scheme dated from 1977, when
London Bridge station Banister. During the first decade of the twentieth century LB&SCR station at London Bridge was again enlarged, but overall London Bridge station remained a "sprawling confusion". The chaotic nature of the station at the turn of the century was described in John Davidson's poem, "London Bridge": The South London Line from London Bridge to Victoria was electrified in 1909 with an experimental overhead system. It was successful and other suburban services were electrified including the line to Crystal Palace in 1912. Because of World War I, the line to Croydon was not electrified until 1920. The Railways Act 1921 led