London Underground at +420 V, giving a potential difference of 630 V. On the sections of line shared with mainline trains, such as the District line from East Putney to Wimbledon and Gunnersbury to Richmond, and the Bakerloo line north of Queen's Park, the centre rail is bonded to the running rails. The average speed on the Underground is 20.5 mph. Outside the tunnels of central London, many lines' trains tend to travel at over 40 mph in the suburban and countryside areas. The Metropolitan line can reach speeds of 62 mph. The London Underground was used by 1.379 billion passengers in
Upminster Bridge Upminster Bridge Upminster Bridge is a crossing of the River Ingrebourne carrying the A124 road between the suburbs of Hornchurch and Upminster in northeast London, England. The bridge is known to have existed since at least 1375 and the current brick bridge was opened in 1892, replacing a series of wooden bridges. It gave its name to the nearby Upminster Bridge tube station, which opened in 1934, and has also been applied to the neighbourhood around the station in the London Borough of Havering. The bridge has been alternatively known as Bridge House Bridge and Lower Bridge, with "Bridge House"