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 in Great Warley. Land for Upminster Park was purchased by the parish council in 1929. The town forms part of the Hornchurch and Upminster UK Parliament constituency, and is covered by the Havering wards of Upminster and Cranham. The current MP is Angela Watkinson. Each ward elects three councillors to Havering London Borough Council. All six councillors elected in 2010 for the two wards were the Upminster and Cranham Residents' Association candidates and the area is unusual in that the residents' association is strongly active. From 1945 to 1974 Upminster formed part of the Hornchurch constituency and from 1974 to