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Den-en-toshi Line
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Den-en-toshi Line
The Den-en-toshi Line (田園都市線, Den'entoshi-sen; "Garden City Line") is a major commuter line operated by the private railway operator Tokyu Corporation and connecting south-western suburbs of Tokyo and neighboring Kanagawa Prefecture, with its western terminus of Chūō-Rinkan, to a major railway junction of western downtown Tokyo, Shibuya. At Shibuya, nearly all the trains continue on the Tokyo Metro Hanzomon Line. With a route length of 31.5 km (19.6 mi), it is the longest railway line operated by Tokyu Corporation.
The line's color on maps and station guides is green, and stations carry the prefix "DT" followed by a number.
On 6 March 1907, the Tamagawa Electric Railway (玉川電気鉄道, Tamagawa Denki Tetsudō; "Tamaden") opened the first section of an interurban line between Shibuya and what is now Futako-Tamagawa, using 1,372 mm (4 ft 6 in) gauge. The line was called the Tamagawa Line (玉川線) and is not to be confused with today's Tokyu Tamagawa Line (東急多摩川線). The branch from Sangen-Jaya Station opened on 18 January 1925.
In 1953, Tokyu Group president Keita Gotō unveiled a "new town" planning scheme called the South-Western Area Development Plan. He envisioned new railway line and freeway and large, clean houses for commuters working in Tokyo. The railway line would become the Tama Den-En-Toshi Line and the expressway the Tōmei Expressway. The parts of the new line completely overlaps the Tamagawa Line and the project is known as the Shin-Tamagawa Line or "New Tamagawa Line" which runs in an underground alignment under the old interurban line. The Tamagawa Line was closed in 1969 in anticipation for the opening of the Shin-Tamagawa Line, with the remaining branch line of the Tamagawa Electric Railway split off into the present Tokyu Setagaya Line. The underground Shin-Tamagawa Line opened a few years later in 1977, completely replacing the closed interurban line. Upon opening it was treated as a separate line from the Ōimachi Line connecting to said line at Futako-Tamagawa.[citation needed]
In 2000, Tama Den-En-Toshi Line as depicted today was created by merging the Shin-Tamagawa Line and the section of the Ōimachi Line west of Futako-Tamagawa.[citation needed] Trains through servicing into the Tokyo Metro Hanzōmon Line was extended beyond Suitengūmae into Isesaki Line and Nikkō Line of Tobu Railway on 19 March 2003.
Tokyu has expanded the line to four tracks from Futako-Tamagawa to Mizonokuchi; most trains of the Ōimachi line run through this section to Mizonokuchi, with some local trains making the intermediate stops. This service began in June 2009, postponed from fiscal 2007. Ōimachi line trains, which are 5- or 7-car sets, will then run between Ōimachi and Mizonokuchi.
On 5 October 2025, around 11:00 p.m, the rear car of an out-of-service Tokyu 5000 series (set 5101) was struck by an oncoming Shibuya-bound Tokyu 2020 series train (set 2035) as it was entering a layover track. The impact caused the out-of-service train to derail. It was hosting a trainee driver under instruction and had reportedly stopped slightly ahead of its designated position, leaving part of the train protruding onto the active track. The collision caused visible damages but no serious injuries were reported among the 149 passengers on board the moving train or among the crew on the stationary train. Following the collision, the operator disclosed that a "signal-setting error" had persisted for years since maintenance works were carried out in 2015. Following the collision, normal services on the Den-en-toshi Line were partially suspended for a few days, with nearby lines such as the Ōimachi Line and the Tokyo Metro Hanzōmon Line also experiencing service suspensions and disruptions. This was caused by the collided trains blocking the trains in train depot from exiting. Tokyu Railways deployed maintenance crews to remove the derailed 5000 series car and to inspect track and signal equipment near Kajigaya Station. To prevent similar accidents, Tokyu Railways inspected 33 other stations with similar track layout.
The accident led to service reductions being implemented on the Den-en-toshi Line with the start of the revised timetable in March 2026. Two months later, Tokyu Railways announced that it would order twenty-three 2020 series cars: three cars to be incorporated into the damaged 2020 series set and two 10-car sets. The operator also announced its goal for the order to be completed by the end of fiscal year 2027.
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Den-en-toshi Line
The Den-en-toshi Line (田園都市線, Den'entoshi-sen; "Garden City Line") is a major commuter line operated by the private railway operator Tokyu Corporation and connecting south-western suburbs of Tokyo and neighboring Kanagawa Prefecture, with its western terminus of Chūō-Rinkan, to a major railway junction of western downtown Tokyo, Shibuya. At Shibuya, nearly all the trains continue on the Tokyo Metro Hanzomon Line. With a route length of 31.5 km (19.6 mi), it is the longest railway line operated by Tokyu Corporation.
The line's color on maps and station guides is green, and stations carry the prefix "DT" followed by a number.
On 6 March 1907, the Tamagawa Electric Railway (玉川電気鉄道, Tamagawa Denki Tetsudō; "Tamaden") opened the first section of an interurban line between Shibuya and what is now Futako-Tamagawa, using 1,372 mm (4 ft 6 in) gauge. The line was called the Tamagawa Line (玉川線) and is not to be confused with today's Tokyu Tamagawa Line (東急多摩川線). The branch from Sangen-Jaya Station opened on 18 January 1925.
In 1953, Tokyu Group president Keita Gotō unveiled a "new town" planning scheme called the South-Western Area Development Plan. He envisioned new railway line and freeway and large, clean houses for commuters working in Tokyo. The railway line would become the Tama Den-En-Toshi Line and the expressway the Tōmei Expressway. The parts of the new line completely overlaps the Tamagawa Line and the project is known as the Shin-Tamagawa Line or "New Tamagawa Line" which runs in an underground alignment under the old interurban line. The Tamagawa Line was closed in 1969 in anticipation for the opening of the Shin-Tamagawa Line, with the remaining branch line of the Tamagawa Electric Railway split off into the present Tokyu Setagaya Line. The underground Shin-Tamagawa Line opened a few years later in 1977, completely replacing the closed interurban line. Upon opening it was treated as a separate line from the Ōimachi Line connecting to said line at Futako-Tamagawa.[citation needed]
In 2000, Tama Den-En-Toshi Line as depicted today was created by merging the Shin-Tamagawa Line and the section of the Ōimachi Line west of Futako-Tamagawa.[citation needed] Trains through servicing into the Tokyo Metro Hanzōmon Line was extended beyond Suitengūmae into Isesaki Line and Nikkō Line of Tobu Railway on 19 March 2003.
Tokyu has expanded the line to four tracks from Futako-Tamagawa to Mizonokuchi; most trains of the Ōimachi line run through this section to Mizonokuchi, with some local trains making the intermediate stops. This service began in June 2009, postponed from fiscal 2007. Ōimachi line trains, which are 5- or 7-car sets, will then run between Ōimachi and Mizonokuchi.
On 5 October 2025, around 11:00 p.m, the rear car of an out-of-service Tokyu 5000 series (set 5101) was struck by an oncoming Shibuya-bound Tokyu 2020 series train (set 2035) as it was entering a layover track. The impact caused the out-of-service train to derail. It was hosting a trainee driver under instruction and had reportedly stopped slightly ahead of its designated position, leaving part of the train protruding onto the active track. The collision caused visible damages but no serious injuries were reported among the 149 passengers on board the moving train or among the crew on the stationary train. Following the collision, the operator disclosed that a "signal-setting error" had persisted for years since maintenance works were carried out in 2015. Following the collision, normal services on the Den-en-toshi Line were partially suspended for a few days, with nearby lines such as the Ōimachi Line and the Tokyo Metro Hanzōmon Line also experiencing service suspensions and disruptions. This was caused by the collided trains blocking the trains in train depot from exiting. Tokyu Railways deployed maintenance crews to remove the derailed 5000 series car and to inspect track and signal equipment near Kajigaya Station. To prevent similar accidents, Tokyu Railways inspected 33 other stations with similar track layout.
The accident led to service reductions being implemented on the Den-en-toshi Line with the start of the revised timetable in March 2026. Two months later, Tokyu Railways announced that it would order twenty-three 2020 series cars: three cars to be incorporated into the damaged 2020 series set and two 10-car sets. The operator also announced its goal for the order to be completed by the end of fiscal year 2027.
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