Services on the Main Line are divided into four categories. Some trains travel along the Izumino Line west of to.
Local - services stop at all stations. They do not travel from end to end; services are split at Futamatagawa, with trains running between Yokohama and Futamatagawa and between Futamatagawa and either Ebina or Shōnandai.
Rapid - services stop between Yokohama and Futamatagawa at Hoshikawa, Nishiya and Tsurugamine, and at all stations from Futamatagawa to either Ebina or Shōnandai.
Express - services run non-stop between Yokohama and Futamatagawa, and stop at all stations west of Futamatagawa to Ebina.
Commuter Express - services stop between Yokohama and Futamatagawa at Nishiya and Tsurugamine, and at all stations from Futamatagawa to either Ebina or Shōnandai.
Commuter Limited Express services stop between Yokohama and Futamatagawa at Nishiya and Tsurugamine, and at Yamato or Izumino from Futamatagawa to either Ebina or Shōnandai.
Limited Express services stop between Yokohama and Ebina at Nishiya, Futamatagawa and Yamato.
Future developments
The Sotetsu Shin-Yokohama Line is currently under construction, linking Nishiya to Hazawa Yokohama-Kokudai, and further to on the Tōkyū Tōyoko Line. The line will allow through services to the JR Lines and Tokyu Lines towards the Tokyo Metropolis from 30 November 2019 and 2022 respectively. With the opening of this new line, Limited Express and Rapid services will make stops at Nishiya, which facilitates transfer between services to central Yokohama and the Tokyo Metropolis. In addition, two new service types will be implemented. They are the Commuter Limited Express and Commuter Express services, which both operate through services from / to the Izumino Line. The former service will replace the current Limited Express on the Izumino Line, and will make additional stops at Nishiya and Tsurugamine. The latter service is a brand new service, making stops at all stations west of Nishiya.
Stations
Local trains stop at all stations; for all other train types, trains stop at stations marked ● and pass stations marked |.
The line opened 12 May 1926 as the steam-operated Jinchu Railway between Futamatagawa and . The line was extended from Futamatagawa to Yokohama in December 1933, and from the former station at Sagami-Kokubu in November 1941. The line became the Sagami Railway Jinchu Line from 1 April 1943. Work to electrify the line commenced in June 1942, with the entire line between Yokohama and Ebina electrified by 20 September 1944. Work to double-track the line commenced in January 1957 between Yokohama and Nishi-Yokohama. The entire line was double-tracked by March 1974. The first air-conditioned trains were introduced on the line on 3 July 1971. 10-car trains started operating on the line from 6 April 1981. Station ticket barriers were modified to allow use of the Passnet magnetic farecard from 1 October 2000. There was a short spur line which branched from Sagamino Station to the Naval Air Facility Atsugiair base. While the track remains in place up to the fence of the base, the line is no longer in use.
