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 Tithe Barn Museum of Nostalgia in 1450 by the nearby priory (dependent on Waltham Abbey). Although commonly known as the "Tithe Barn", the building was never used for the collection of tithes and a grange barn might be a more accurate designation (Upminster's real tithe barn adjoined the Rectory in what is now Gridiron Place). Upminster station is the nearest National Rail and London Underground station. The Upminster Tithe Barn Museum is served by London Buses route 248. Upminster Tithe Barn Museum of Nostalgia The Upminster Tithe Barn Museum of Nostalgia is a small museum located in Upminster in the London Borough of Havering, London,