Why you should experience Odakyu Line in Tokyo, Japan.
Odakyu Line is a formative rail corridor where Shinjuku's metropolitan reach, private-railway ambition, western suburban expansion and enduring connection with Hakone begin at the western edge of Tokyo's largest railway district.
Running through Shinjuku between the station complex and Yoyogi before extending southwest through Setagaya toward Kanagawa, the corridor carries the Odawara Line from an intensely vertical city center into residential districts whose twentieth-century growth became closely tied to railway access. Express and local services share the axis with Romancecar limited expresses, giving the route a layered role spanning metropolitan movement and longer journeys toward Odawara and Hakone. Nearly a century of railway investment has repeatedly altered the physical relationship between the tracks and neighborhoods farther west. The result is a corridor where a private railway launched toward Odawara became one of the principal forces connecting Central Tokyo with western suburbs and mountain destinations.
What you should know about Odakyu Line.
Odakyu Line is best known for originating with Toshimitsu Tsurumatsu's Odawara Express Railway, established in 1923 before the 82.5-kilometer Odawara Line opened between Shinjuku and Odawara on April 1, 1927. The railway began with the unusual advantage of being double-tracked across its entire main line, establishing substantial capacity between Tokyo and western Kanagawa from its first day. Enoshima Line followed in 1929, extending the company's reach from Sagami-Ono toward Katase-Enoshima. Wartime consolidation absorbed the railway into Tokyo Kyuko Electric Railway in 1942 as southwestern Tokyo's major private operators were combined under a single organization. Odakyu Electric Railway emerged as an independent company in June 1948 and introduced nonstop weekend limited expresses between Shinjuku and Odawara that October. Through service onto the Hakone Tozan Line reached Hakone-Yumoto in 1950, binding the railway's metropolitan origin to the mountain destination that became central to its postwar character.
Postwar engineering gave that Shinjuku-Hakone connection an internationally consequential technological chapter through the Romancecar SE, or 3000 series, introduced in July 1957. Odakyu developed the articulated train as a lightweight high-performance limited express, then sent an SE set onto Japanese National Railways' Tokaido Main Line between Kannami and Numazu for high-speed testing that September. The train reached 145 kilometers per hour on September 27, establishing the narrow-gauge world speed benchmark of its era. Knowledge gained through those trials fed into Japan's wider pursuit of high-speed railway technology during the period preceding the Tokaido Shinkansen. Romancecar NSE followed in 1963, and Shinjuku Station gained its two-level ground and underground platform arrangement in 1964. Odakyu's postwar trajectory joined destination travel, rolling-stock experimentation and terminal expansion into a railway culture whose technological ambitions reached far beyond its own tracks.
How to fold Odakyu Line into your trip.
Odakyu Line works as the anchor for a daytime exploration tracing underground railway integration, the remaking of former track territory and one of Tokyo's strongest surviving centers of independent performance culture along the inner section of the route.
Begin at Yoyogi-Uehara Station, where Odakyu's suburban railway acquired a direct underground connection with central and eastern Tokyo when reciprocal operation with the Eidan Subway Chiyoda Line began on March 31, 1978. Trains initially ran between Hon-Atsugi and Ayase, linking Odakyu territory with the subway without requiring passengers to transfer at Shinjuku. The connection changed the network from a predominantly Shinjuku-focused railway into a cross-city system and remains one of the most consequential junctions on the inner Odawara Line, carrying services between western suburbs and the Tokyo Metro network through a single operating axis. Continue to Shimokitazawa Senrogai, created across approximately 1.7 kilometers of former surface railway territory released when the Odakyu tracks between Higashi-Kitazawa and Setagaya moved underground in 2013. The final four-track configuration entered service in March 2018, completing a project whose construction had begun in 1989 farther west and whose full Yoyogi-Uehara-Noborito section spans 11.7 kilometers. Odakyu subsequently developed the former alignment under the Shimokitazawa Senrogai name, with the complete precinct debuting in May 2022 and converting railway territory once defined by tracks and crossings into a new linear district. Conclude at The Suzunari, created in 1981 by actor and theater producer Kazuo Honda as part of the cluster that made Shimokitazawa synonymous with Japan's small-theater movement. The compact auditorium became associated with independent companies, playwrights and performers working outside the scale of major commercial theaters, strengthening a theatrical concentration that expanded through Honda's subsequent venues around the neighborhood. Its enduring role places performance culture beside the railway history that brought generations of audiences and artists into Shimokitazawa, joining transportation and creative production within the same compact district. The progression moves from the 1978 cross-city railway connection through the conversion of former surface tracks into Shimokitazawa Senrogai and onward to Kazuo Honda's small-theater culture, revealing how successive chapters of Odakyu Line development altered both movement and creative life along Tokyo's western railway axis.
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