line city line london underground runs coloured salmon pink tube map serves stations miles runs ground central section bow road skirts capital financial heart tunnels surface similar size british main lines track stations shared district circle metropolitan lines parts sub surface railway million passenger journeys year line circle line stations served ground metropolitan railway began world underground railway service wooden carriages steam locomotives following year railway west opened soon operated owned jointly metropolitan railways line extended east stages reaching line electrified metropolitan railway absorbed trains extended line city route shown tube map metropolitan line appeared separate line track signalling systems upgraded old car trains replaced new car stock trains programme increase capacity cent line runs parallel parallel london railway history metropolitan railway line built metropolitan railway met near near london financial heart city gas lit wooden carriages hauled steam locomotives opened january world underground railway line built new road cut cover method king cross tunnel road supported met built main line mile west station developing suburbs shepherd bush built largely open fields line opened june service services road link road starting weeks later met ran trains trains line jointly owned companies additional tracks parallel brought use flat crossing park replaced dive year earlier services extended grove road railway station line richmond railway extended east terminus opened november met wished access jointly district railway built lines mansion house station met station east reach october met extended services opened linking district railway london ground junction bow west station district services extended east line electrified services richmond withdrawn western termini road east services diverted electrified services ran car electric multiple units jointly owned sold theirs met july metropolitan railway amalgamated underground railways companies bus operators form relieve congestion district line east trains diverted line trains withdrawn november line trains terminating longer car line trains ran caused operational problems served trains new steel stock trains doors remotely operated guard replaced wooden bodied trains dating intended operate new trains cars initial problems traction current car formations services curve road suspended bomb damage line restarted war similar trains running circle line lengthened cars stock lines integrated maintenance depot aluminium stock trains public address systems originally replaced trains person operation proposed conflict trade unions introduced separate identity route shown tube map metropolitan line shown separately metropolitan line route northwards metro land infrastructure city line partly public private partnership managed consortium went administration local government body transport london took responsibilities reconstruction station new underground line required reversing platforms taken use december services extended stock trains recently replaced stock new train entered service city line july running shuttle service operating december march services provided stock trains route line miles long stations track shared london underground sub surface lines baker street circle line baker street circle metropolitan lines station district line stations shared lines line electrified rail system central conductor rail rail outside running rails giving potential difference chain double track railway terminus park station foot high brick line passes beneath main line royal oak station running alongside main lines station line enters cut cover tunnel end platforms meets circle line passing road station cutting king cross line cutting passing carries services bay platforms line circle metropolitan lines line passes london station continuing mile surfaces bow runs alongside london line street station interchange jubilee line bay platform station line terminates stations services december peak trains hour calling stations requiring trains peak hour service circle line million passenger journeys year journey takes minutes peak central section fare zone west east bow zone zone rolling stock services provided seven car stock family air conditioning sub surface tunnels unlike deep level tube lines able disperse exhausted hot air trains brakes returning cent energy network speed mph car stock train capacity passengers compared car stock train replaced length feet trains feet longer foot long trains station platforms lengthened planned increase traction voltage present nominal better performance allow trains return energy network brakes depot line depot close station built operated metropolitan railway joint railway electrified early 20th century near high street triangle stable trains overnight stock era greater length new stock trains longer use upgrade programme introduction trains track electrical supply signalling systems upgraded programme planned increase peak hour capacity circle lines cent end single control room sub surface railway established automatic train control system replace signalling equipment installed 1940s cross line planned open expected reduce list stations
Hammersmith & City line