Between Totsuka and Nippa, they only stop at Kaminagaya, Kamiooka, Kannai, Sakuragicho, Yokohama, and Shin-Yokohama.

Although Blue■ is mainly used in the direction curtain display of the vehicle and the guidance of the station campus, it is not necessarily united in case of green■.

As of 1 April 2016[update], the line is operated using a fleet of 37 six-car 3000 series EMUs based at Kaminagaya Depot.

The subway was inaugurated on 16 September 1972, when the 5.2 km (3.2 mi) long initial section of Line 1 opened between Kami-Ōoka and Isezakichōjamachi stations.

The most recent extension of Line 3, a 10.9 km (6.8 mi) section from Shin-Yokohama to Azamino opened on 18 March 1993.

The final 7.4 km (4.6 mi) section of Line 1 from Totsuka to Shōnandai opened on 28 August 1999.

[6][7] In June 2020, the Transportation Bureau started environmental impact assessment procedures of the extension project.