Odakyū Odawara Line

The Odakyu Odawara Line (小田急小田原線) is the main line of Japanese private railway operator Odakyu Electric Railway. It extends 82.5 km from Shinjuku in central Tokyo through the southwest suburbs to the city of Odawara, the gateway to Hakone in Kanagawa Prefecture. It is a busy commuter line and is also known for its "Romancecar" limited express services. From Yoyogi-Uehara Station some trains continue onto the Tokyo Metro Chiyoda Line and beyond to the East Japan Railway Company Joban Line.

Operation
Destinations are from Shinjuku unless noted. English abbreviations are tentative for this article.


 * Limited Express (特急)
 * Collectively known as "Romancecar" services, there is an extra seat charge for limited express service. Daytime service trains bound for: Odawara; Katase-Enoshima on the Enoshima Line; Hakone-Yumoto on the Hakone Tozan Railway; and Gotemba on the Central Japan Railway Company Gotemba Line.


 * Rapid Express (快速急行) (RE)
 * No extra charge. Services are for Odawara and Fujisawa on the Odakyu Enoshima Line all Rapid Express trains that are bound for Odawara terminates at Shin-Matsuda and becomes Express.


 * Express (急行) (E)
 * Services are for Karakida, as well as thrice-hourly service between Machida and Odawara.


 * Semi Express (準急) (SE)
 * Most services are for Mukōgaoka-Yūen. All services run through on the Tokyo Metro Chiyoda Subway Line with some continuing on to the JR Joban Line.


 * Local (各駅停車)
 * Most services for Hon-Atsugi; others to Odawara, through to Katase-Enoshima and the Tama and Hakone Tozan lines. Also service between Odawara to Hakone-Yumoto


 * Commuter Express (通勤急行) (CE)
 * All services operate in the weekday morning for Shinjuku from Karakida on the Odakyu Tama Line.


 * Commuter Semi Express (通勤準急) (CS)
 * All services operate from Hon-Atsugi to the Chiyoda Line during weekday mornings.

Stations
Notes:
 * See the Romancecar article for information on Odakyu Romancecar limited express services.
 * Local trains stop at every station.

Legend:
 * ● - all trains stop at this station; ■ - some trains stop at this station;｜- all trains pass; ○ - On Weekdays, Outbound for Isehara Evening Rush Hour only.
 * "CS" - Commuter Semi Express; "CE" - Commuter Express "SE" - Semi-Express; "E" - Express; "RE" - Rapid Express

History
The Odawara Express Railway Co. opened the entire line on April 1, 1927 in order to allow for the Emperor's family to travel on the line, though as duplication works were not completed until October that year, there was initial timetable and signalling issues. Although primarily intended as a passenger line, gravel began to be hauled in 1930.

In 1942, the company was forcibly merged by the government with Tokyu Corporation and the line was named the Tokyu Odawara Line. Tokyu was broken up in 1948 and the line was transferred to the newly founded Odakyu Electric Railway Co.

Through operation to the Hakone Tozan Railway's Hakone Tozan Line began in 1950 once dual gauge track was commissioned (the Hakone Tozan Line is, the Odawara Line ). A connecting track was laid in 1955 to Matsuda Station on the Gotemba Line of the (then) Japanese National Railways, and limited express service through to the line started. To function as a bypass to central Tokyo, through service on the Eidan Subway (now Tokyo Metro) Chiyoda Line commenced in 1978 via Yoyogi-Uehara.

Increasing traffic volume since the 1970s led to plans being formed in 1985 for a track upgrading project on the Odawara Line, though land acquisition issues stalled major track expansion work until construction began in 2013; the project is being carried out between Yoyogi-Uehara and Mukōgaoka-Yūen, quadrupling the Odawara Line trackage and stacking the tracks underground, allowing for increased express services. Originally a viaduct was planned but this was changed to underground tracks, and work on the tunnel between Setagaya-Daita and Higashi-Kitazawa was completed in 2018.

Former connecting lines

 * Setagaya-Daita Station: A gauge line electrified at 1,500 V DC operated to Shindaita on the Keio Inokashira Line between 1945 and 1952.