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 248 and 370 bus routes, with services to Cranham, Romford, Upminster and Lakeside. The London Loop key walking route passes through the Upminster Bridge area, and the station forms the end point of section 22 from Harold Wood and the starting point of section 23 to Rainham. Until 1972, bus routes on the A124 road that crosses the narrow bridge were more numerous. Before 248 was extended from its orbital run around Upminster Park Estate to connect into Romford town centre, the London Transport buses reaching Upminster station were the 193 and the 86. The latter running all the way