Circle line (London Underground) with the other London Underground sub-surface lines: the Hammersmith & City line from Hammersmith to just before Aldgate; the Metropolitan line from Baker Street to Aldgate; and the District line from Tower Hill station to Edgware Road station. The line is electrified with a four-rail DC system: a central conductor rail is energised at and a rail outside the running rail at , giving a potential difference of . The running rails are not electrified. Much of the double track railway from the Hammersmith terminus to Westbourne Park station is on a high brick viaduct. East of Westbourne Park the
Upminster connected settlement of Cranham and the rural outlier of North Ockendon. In 2001 the population of Upminster ward was 12,674 and Cranham ward was 12,242, giving a total population of 25,098. 80.95% in Upminster and 81.73% in Cranham report their religion as Christian, compared to 76.13% for Havering, 58.23% in London and 71.74% in England. 10.08% in Upminster and 10.46% in Cranham report having no religion, compared to 13.18% in Havering, 15.76% in London and 14.59% in England. With a black and minority ethnic population of 3% in 2001, Cranham and Upminster wards have the lowest Simpson index for ethnic