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| Yokohama Municipal Subway Blue Line | |
|---|---|
 | |
 A 3000R series train on the Blue Line in October 2019 | |
| Overview | |
| Native name | 横浜市営地下鉄ブルーライン |
| Owner | Yokohama City Transportation Bureau |
| Line number | 1 & 3 |
| Locale | Yokohama, Fujisawa |
| Termini | |
| Stations | 32 |
| Service | |
| Type | Rapid transit |
| System | Yokohama Municipal Subway |
| Services | Line 1 (Shonandai–Kannai) Line 3 (Kannai–Azamino) |
| Operator(s) | Yokohama City Transportation Bureau |
| Depot(s) | Kaminagaya, Nippa |
| Rolling stock | 3000 series 4000 series |
| Daily ridership | 513,897 (FY2014) |
| History | |
| Opened | 16 December 1972 |
| Technical | |
| Line length | 40.4 km (25.1 mi) (Line 1: 19.7 km, Line 3: 20.7 km) |
| Number of tracks | 2 |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
| Electrification | 750 V DC third rail |
| Operating speed | 80 km/h (50 mph) |
The Yokohama Municipal Subway Blue Line (横浜市営地下鉄ブルーライン, Yokohama Shiei Chikatetsu Burū Rain) is a rapid transit line serving Yokohama in Kanagawa Prefecture, Japan. It is the longer of the two lines in the Yokohama Municipal Subway system operated by Yokohama City Transportation Bureau, and is the second-longest subway line in Japan at 40.4 kilometers (25.1 mi) in length, surpassed only by the 40.7-kilometer (25.3 mi) long Toei Oedo Line in Tokyo. Unlike most metro lines in Japan, it uses third rail for power instead of overhead lines. It is the most recent newly built steel-wheel railway line in Japan to do so.
The Blue Line is divided into two operating segments: Line 3 from Azamino in Aoba-ku, Yokohama to Kannai, and Line 1 from Kannai to Shōnandai in Fujisawa. Local and rapid services operate continuously on both lines 1 and 3 as a single service.
Following the opening of the Green Line on 30 March 2008, the line was nicknamed the "Blue Line". The line color is blue and the line symbol used in the station numbering is B.