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
Guadalajara light rail system Guadalajara light rail system The Guadalajara light rail system (), which is operated by SITEUR (Sistema de Tren Eléctrico Urbano, Spanish for Urban Electrical Train System), is a light rail system serving the municipalities of Guadalajara, Zapopan and Tlaquepaque, in the state of Jalisco, Mexico. It is owned by the state of Jalisco, and operator SITEUR is a state authority. Opened in 1989, the system currently has two lines: Line 1, running from north to south, with 19 stations, and Line 2, running from the city centre to the east, with 10 stations. The history of urban trains in Guadalajara