Sotetsu 20000 series

The Sotetsu 20000 series (相鉄20000系) is an electric multiple unit (EMU) commuter train type operated by the private railway operator Sagami Railway ("Sotetsu") in Japan in the Tokyo area since February 2018. Ultimately intended to be used on through-running services between Sotetsu and Tokyu Corporation lines commencing in late fiscal 2022, the first train entered revenue service on 11 February 2018, replacing a 7000 series set.[1]

Sotetsu 20000 and 21000 series
Set 20102 in May 2021
In serviceFebruary 2018–present
ManufacturerHitachi
Built atKudamatsu, Yamaguchi
Family nameA-train
Replaced7000 series
Constructed2017–present
Entered service
  • 11 February 2018 (20000 series)
  • 6 September 2021 (21000 series)
Number under construction
  • 21000 series: 8 vehicles (1 set)
Number built
  • 20000 series: 70 vehicles (7 sets)
  • 21000 series: 56 vehicles (7 sets)
Number in service
  • 20000 series: 70 vehicles (7 sets)
  • 21000 series: 48 vehicles (6 sets)
Formation
  • 10 cars per trainset (20000 series)
  • 8 cars per trainset (21000 series)
Fleet numbers
  • 20101–20107 (10-car sets)
  • 21101–21107, 21009 (8-car sets)
Operator(s)Sotetsu
Line(s) served
Specifications
Car body constructionAluminium alloy
Car length
  • 20.47 m (67 ft 2 in) (end cars)
  • 20 m (65 ft 7 in) (intermediate cars)
Width2,787 mm (9 ft 1.7 in)
Height4,065 mm (13 ft 4.0 in)
Floor height1.13 m (3 ft 8 in)
Doors4 pairs per side
Maximum speed120 km/h (75 mph) (design speed)
Traction systemSiC-SBD hybrid 2-level Si-IGBT–VVVF (Hitachi), type VFI-HR1421G
Traction motors190 kW (250 hp) HS32536-04RB fully-enclosed 3-phase AC induction motor (Hitachi)
Electric system(s)1,500 V DC (nominal) from overhead catenary
Current collector(s)Toyo Denki PT-7103G single-arm pantograph
Track gauge1,067 mm (3 ft 6 in)

Eight-car sets designated as 21000 series were announced in April 2021,[2] the first of which entered service in September 2021.[3]

Design

The fleet of ten-car 20000 series trainsets is being built by Hitachi at its Kasado Factory in Kudamatsu, Yamaguchi.[1] Externally, the trains carry the "Yokohama Navy Blue" corporate livery introduced for refurbished 9000 series trains.[1]

Formation

20000 series

The trains are formed as ten-car sets, as follows, with five motored ("M") cars and five non-powered trailer ("T") cars, and car 1 at the Yokohama end.[4]

Car No.12345678910
Designation Tc2M1T1M2M3T2M4T3M5Tc1
Numbering 2010x2020x2030x2040x2050x2060x2070x2080x2090x2000x
Weight (t) 29.931.729.831.131.226.931.729.131.130.0
Capacity (seated/total) 45/13351/14451/14351/14351/14351/14351/14351/14351/14345/133

21000 series

The trains are formed as eight-car sets with four motored ("M") cars and four non-powered trailer ("T") cars, and car 1 at the Yokohama end, as follows.

Car No.12345678
Designation Tc2M1T1M2M3T2M4Tc1
Numbering 2110x2120x2130x2140x2150x2160x2170x2180x
Weight (t) 29.931.729.831.131.729.131.130.0
Capacity (seated/total) 45/13351/14451/14345/133

Interior

Passenger accommodation consists of longitudinal bench seating with grey moquette seat covers.[5] Each car includes a space for wheelchairs and pushchairs.[5]

  • A car interior in February 2018
    A car interior in February 2018
  • Universal design priority seating
    Universal design priority seating
The interior with lighting adjusted to a warmer hue (3000 K) in late evening

The colour temperature of the interior LED lighting is adjusted automatically according to time of day and season as follows (hues shown are illustrative only).[4]

SeasonTime of dayColour temperature [K]Intensity [%]
Spring
(1 April - 30 June)		Early morning02:01:00 - 06:59:59  440090
Morning peak07:00:00 - 09:59:59  500090
Daytime10:00:00 - 15:59:59  440090
Evening16:00:00 - 17:59:59  440090
Night18:00:00 - 02:00:59  3000100
Summer
(1 July - 30 September)		Early morning02:01:00 - 06:59:59  500090
Morning peak07:00:00 - 09:59:59  500090
Daytime10:00:00 - 15:59:59  500090
Evening16:00:00 - 17:59:59  440090
Night18:00:00 - 02:00:59  3000100
Autumn
(1 October - 31 December)		Early morning02:01:00 - 06:59:59  440090
Morning peak07:00:00 - 09:59:59  440090
Daytime10:00:00 - 15:59:59  440090
Evening16:00:00 - 17:59:59  3800100
Night18:00:00 - 02:00:59  3000100
Winter
(1 January - 31 March)		Early morning02:01:00 - 06:59:59  3300100
Morning peak07:00:00 - 09:59:59  3800100
Daytime10:00:00 - 15:59:59  440090
Evening16:00:00 - 17:59:59  440090
Night18:00:00 - 02:00:59  3000100

History
The first set on delivery in July 2017

Details of the new trains were officially announced in June 2017.[5] The first train set was delivered from the Hitachi factory in Kudamatsu, Yamaguchi, in late July 2017.[6]

Originally scheduled to enter revenue service in December 2017, scheduled service entry was subsequently postponed until 11 February 2018.[7][8] In late August 2022, both the 20000 and 21000 received formation stickers located in the window of each head car before the beginning of service along the Sotetsu-Tokyu Link. These stickers will also help passengers distinguish how long each set is before boarding. Set 20103 was the first to receive a larger sticker displaying the last three digits of the Ebina bound head car of the set (eg, “003”). As of late October 2022, all sets have received formation stickers.

21000 series

An order for a shorter version of the 20000 series was announced on 28 April 2021. These four eight-car sets will be designated as 21000 series, and are to be operated through to lines of Tokyu Corporation.[2] The first 21000 series set entered service on 6 September 2021.[3][9] In late August 2022, the 21000 sets are being given stickers located at the end of each set to help passengers tell them apart from the identical 20000 series. In addition to formation number stickers (the last three digits of the Ebina bound head end car), they were also given “8-Cars” stickers as well, all of which was completed by late October 2022. Sotetsu had also announced an additional order for 9 more 21000 sets to help expand the fleet before service to Shin-Yokohama begins. As of November 2022, two sets (21105F and 21106F) have been delivered and entered service. It is planned that one more set (21107F) will be delivered before the end of the year 2022 while the remaining sets will be delivered in early 2023.

Set 21109F was delivered in April 2023.[10]

References
  1. 都心直通用新型車両「２００００系」を導入 [New 20000 series trains to be introduced on Tokyo through-running services] (PDF). News letter (in Japanese). Japan: Sagami Railway. 5 June 2017. Retrieved 5 June 2017.
  2. "Sotetsu orders Hitachi EMUs to work Tokyo through services". railwaygazette.com. DVV Media International. 10 May 2021. Retrieved 1 June 2021.
  3. "Sotetsu Series 21000 EMU enters service". railwaygazette.com. DVV Media International. 9 September 2021. Retrieved 16 September 2021.
  4. 相模鉄道20000系 主要諸元表 [Sagami Railway 20000 series main specifications]. Tetsudo Daiya Joho Magazine (in Japanese). Vol. 47, no. 407. Japan: Kotsu Shimbun. March 2018. p. 51.
  5. Ueshin, Daisuke (5 June 2017). 相鉄20000系、新型車両12月デビュー! 日立製作所が製造、今年度は1編成導入 [New Sotetsu 20000 series trains to debut in December! 1st set to be introduced this year, built by Hitachi]. Mynavi News (in Japanese). Japan. Archived from the original on 5 June 2017. Retrieved 5 June 2017.
  6. 相鉄20000系が甲種輸送される [Sotetsu 20000 series delivered]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 1 August 2017. Archived from the original on 1 August 2017. Retrieved 1 August 2017.
  7. 相鉄20000系，2月11日から営業運転を開始 [Sotetsu 20000 series to enter revenue service from 11 February]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 22 December 2017. Archived from the original on 22 December 2017. Retrieved 22 December 2017.
  8. 相鉄20000系が営業運転を開始 [Sotetsu 20000 series enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 12 February 2018. Archived from the original on 12 February 2018. Retrieved 12 February 2018.
  9. "相模鉄道の新型21000系が運行開始 東急直通見据え 兄貴分20000系と何が違う？". trafficnews.jp (in Japanese). Mediavague Co., ltd. 7 September 2021. Archived from the original on 16 September 2021. Retrieved 16 September 2021.
  10. "相鉄21000系第9編成が甲種輸送される" [Delivery of Sotetsu 21000 series set 21009]. Japan Railfan Magazine Online (in Japanese). 20 April 2023. Retrieved 20 April 2023.
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