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| A20 line | |
|---|---|
| Name | A20 line |
| Type | Rapid transit |
| Locale | Tokyo, Kanagawa Prefecture |
| Status | Operational |
| Stations | 24 |
| Opened | 1972 |
| Owner | Tokyo Metropolitan Government / Odakyu Electric Railway |
| Operator | Tokyo Metro / Odakyu Electric Railway |
| Character | Underground and elevated |
| Depot | Nakano Depot, Hon-Atsugi Depot |
| Stock | 4000 series, 9000 series |
| Linelength | 28.7 km |
| Electrification | 1,500 V DC overhead catenary |
| Speed | 100 km/h |
A20 line The A20 line is a rapid transit line serving the western and southwestern corridors of the Tokyo metropolitan area, linking central Shinjuku with suburban and regional hubs in Kanagawa Prefecture. It integrates urban subway infrastructure with intercity services operated by municipal and private railways, providing high-frequency commuter connections and limited express runs. The line interchanges with multiple trunk lines and intersects major nodes such as Shinjuku Station, Nakano, and Hon-Atsugi, forming part of broader transit networks centered on Tokyo Metropolitan Government planning and private operator coordination.
The route runs from Shinjuku Station westward through Nakano, Kichijoji, and Tama corridors before crossing into Kanagawa Prefecture to serve Sagamihara and terminate at Hon-Atsugi Station. It parallels arterial routes such as the Chuo Main Line and connects with regional services like the Odakyu Odawara Line and the JR East network at key transfer points. Infrastructure alternates between deep-level tunnel sections beneath dense districts and elevated viaduct segments across suburban zones, incorporating junctions with the Keio Line, Seibu Shinjuku Line, and the Yokohama Line for through-running operations. Stations are designed to interface with municipal bus hubs and park-and-ride facilities managed by the Tokyo Metropolitan Government and local municipalities.
Initial planning originated in post-war metropolitan transit plans influenced by reconstruction efforts involving figures such as Shigeru Yoshida and urban planners tied to the Ministry of Land, Infrastructure, Transport and Tourism. Construction commenced in 1968 with civil contractors coordinated alongside private operators including Odakyu Electric Railway and corporate stakeholders like Mitsubishi Heavy Industries. The first segment opened in 1972 between Shinjuku Station and Nakano, followed by staged extensions through the 1970s and 1980s reaching Kichijoji and suburban termini. Integration with the JR East and through-service agreements in the 1990s reflected wider network rationalization seen in projects like the Keiyo Line expansions. Major upgrades in the 2000s paralleled initiatives under leaderships tied to the Tokyo Metropolitan Government and involved collaboration with international contractors who had worked on projects such as the Seoul Metropolitan Subway.
Regular services comprise local, rapid, and limited express patterns operated by Tokyo Metro and joint through-runs with Odakyu Electric Railway rolling stock, timed to coordinate with peak flows into Shinjuku Station and interchanges at Kichijoji. Timetabling coordinates with long-distance commuter expresses on the Chuo Main Line and connecting services on the Keio Line to optimize transfers at major hubs like Meidaimae and Shin-Kodaira. Nighttime operations align with metropolitan transport policies influenced by events such as the Tokyo Olympics preparations, while special seasonal services connect with cultural venues near Tama Center and festival sites associated with Yokohama. Fare integration uses regional IC systems compatible with networks operated by JR East, Keikyu, and Tokyu Corporation.
Stations feature multi-modal interchanges at major nodes: Shinjuku Station offers transfers to JR East, Keio Corporation, and Toei Shinjuku Line platforms; Nakano connects with local bus terminals; Kichijoji interfaces with municipal tram and bus services. Suburban stops such as Tama, Hashimoto, and Hon-Atsugi Station include park-and-ride, bicycle parking, and retail concourses developed in partnership with private developers like Mitsui Fudosan and Tokyu Land Corporation. Accessibility upgrades echo standards seen in stations across Tokyo and Yokohama, with elevators, tactile paving, and platform screen doors implemented at high-traffic stations to harmonize with safety norms promoted by the Ministry of Land, Infrastructure, Transport and Tourism.
Track infrastructure consists of dual gauge standard tracks electrified at 1,500 V DC overhead catenary, with signaling systems progressively upgraded from automatic block to Communications-Based Train Control influenced by deployments on the JR East Saikyo Line and Tokyo Metro Ginza Line. Depots at Nakano Depot and Hon-Atsugi Depot handle maintenance, stabling, and periodic overhauls undertaken by manufacturers including Hitachi, Kawasaki Heavy Industries, and Mitsubishi Electric. Rolling stock comprises multiple series optimized for mixed urban and suburban service patterns; fleet examples are analogous to the 4000 series and 9000 series used by peer operators, featuring longitudinal seating, regenerative braking, and passenger information systems compatible with IC fare integration from providers like Suica and PASMO.
Safety protocols follow regulatory frameworks promulgated by the Ministry of Land, Infrastructure, Transport and Tourism and lessons from incidents on lines such as the Chuo Main Line and Tohoku Shinkansen. Notable incidents have prompted investigations involving the National Police Agency and transport safety boards, resulting in infrastructure enhancements like platform screen doors, intrusion detection systems, and revised emergency response coordination with municipal fire services including Tokyo Fire Department. Operational disruptions during extreme weather events have led to resilience measures similar to those adopted after storms affecting the Keiyo Line and Odakyu networks.
Planned projects include signaling modernization to full CBTC interoperability, station capacity expansions at Shinjuku, and corridor improvements to permit increased through-running with operators such as Odakyu Electric Railway and potential connections modeled after extensions like the Toei Oedo Line expansions. Ridership growth forecasts tied to urban redevelopment initiatives in districts like Nakano and Kichijoji have driven proposals for rolling stock procurement from vendors like Hitachi and Kawasaki Heavy Industries, and coordinated urban design projects with developers including Mitsui Fudosan to integrate transit-oriented development around key stations.
Category:Rapid transit lines in Tokyo