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E531 series
E531 series
	An E531 series train on the Joban Line (in March 2019 Between Matsudo Station and Kanamachi Station)
In service	2005–present
Manufacturer	Tokyu Car Corporation, Kawasaki Heavy Industries, JR East, J-TREC
Replaced	403 series, 415 series, some E501 series
Constructed	2005–2020, 2024
Entered service	9 July 2005
Number built	461 vehicles 26 × 10-car; 40 × 5-car; 1 × end car; ;
Number in service	460 vehicles
Formation	5/10 cars per trainset
Fleet numbers	K401–K426 (10-car sets); K451–K483 (standard 5-car sets); K551–K557 (cold-weather 5-car sets);
Operators	JR East
Depots	Katsuta
Lines served	■ Ueno–Tokyo Line; ■ JJ Jōban Line; ■ Mito Line; ■ Tōhoku Main Line;
Specifications
Car body construction	Stainless steel
Car length	20,000 mm (65 ft 7 in)
Width	2,950 mm (9 ft 8 in)
Floor height	1,130 mm (3 ft 8 in)
Doors	4 pairs per side
Maximum speed	130 km/h (81 mph)
Traction system	PWM 2-level IGBT–VVVF (Hitachi)
Traction motors	4 × 140 kW (190 hp) 3-phase AC induction motor (Hitachi)
Power output	1.12 MW (1,500 hp) (5-car sets); 2.24 MW (3,000 hp) (10-car sets)
Acceleration	2.5 km/(h⋅s) (1.6 mph/s)
Deceleration	4.2 km/(h⋅s) (2.6 mph/s)
Electric system(s)	1,500 V DC and 20 kV 50 Hz AC, both from overhead catenary
Current collector(s)	PS37A single-arm pantograph
Bogies	DT71 (motored); TR255 (trailer)
Braking system(s)	Regenerative brake
Safety system(s)	ATS-SN, ATS-P, ATS-Ps
Track gauge	1,067 mm (3 ft 6 in)

The E531 series (Japanese: E531系, Hepburn: E531-kei) is an electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) in Japan.^[1] It was introduced by JR East on 9 July 2005 to replace the aging 403 and 415 series EMUs running on the Jōban Line from Ueno Station in Tokyo. The stock is a dual-voltage (1,500 V DC & 20 kV AC) development of the DC-only E231 series suburban EMU design, and can run at speeds of up to 130 km/h (81 mph) in service.^[2]

Operations

Tōkaidō Main Line (Shinagawa–Tokyo)
Ueno–Tokyo Line
Jōban Line (Ueno–Haranomachi)
Mito Line
Tōhoku Main Line (Kuroiso–Shin-Shirakawa)

Trains are formed in 10-car (set numbers K401–K426) and 5-car (set numbers K451–K483, K551–K557) sets. 15-car formations are generally run between Shinagawa and Tsuchiura. 10- and 5-car sets operate singly north of Tsuchiura, and 5-car sets are used on the Mito Line. 5-car cold weather sets (E531-3000 series) are used on the Tōhoku Main Line between Kuroiso and Shin-Shirakawa, to handle the change of electrification from DC to AC just north of Kuroiso.

Formations

10-car sets

As of 1 October 2018, 26 ten-car sets (K401–K426) are based at Katsuta Depot and formed with four motored ("M") cars and six non-powered trailer ("T") cars.^[3]

Car No.	10	9	8	7	6	5	4	3	2	1
	← Takahagi Shinagawa →

Designation	Tc	T	M	M'	T'	Tsd	Tsd'	M	M'	Tc'
Numbering	KuHa E531-0	SaHa E531-0/-2000	MoHa E531-2000	MoHa E530-2000	SaHa E530-2000	SaRo E531-0	SaRo E530-0	MoHa E531-1000	MoHa E530-0	KuHa E530-0

Cars 3 and 8 each have one single-arm pantograph.^[3]
Cars 1 and 10 have a wheelchair space.^[3]
Cars 1, 5, and 10 each have a toilet (universal design in cars 1 and 10).^[3]
Car 8 is designated as a mildly air-conditioned car.^[3]
Cars 4 and 5 are bilevel Green Cars.^[3]
Car 9 in sets K412–K422 are numbered in the -2000 series and have longitudinal seating (these cars were originally cars 4 and 5 in sets K401–K406); in all other sets, they are numbered in the -0 series and have some transverse seating bays.^[3]
Cars 1, 2, and 10 have some transverse seating bays.^[3]

Standard 5-car sets

As of 3 March 2020, 33 five-car sets (K451–K483) are based at Katsuta Depot and formed with two motored ("M") cars and three non-powered trailer ("T") cars.

Car No.	15	14	13	12	11
	← Haranomachi Oyama, Shinagawa →

Designation	Tc	T	M	M'	Tc'
Numbering	KuHa E531-1000	SaHa E531-0	MoHa E531-0	MoHa E530-1000	KuHa E530-2000

Car 13 has one single-arm pantograph.^[3]
Cars 11 and 15 have a wheelchair space.^[3]
Car 11 has a universal design toilet.^[3]
Car 14 is designated as a mildly air-conditioned car.^[3]
Cars 13, 14, and 15 have some transverse seating bays.^[3]

Cold-weather 5-car sets

As of 1 October 2018, seven five-car sets (K551–K557) are based at Katsuta Depot and formed with two motored ("M") cars and three non-powered trailer ("T") cars.^[3]

Car No.	15	14	13	12	11
	← Haranomachi, Kuroiso Shin-Shirakawa, Shinagawa →

Designation	Tc	T	M	M'	Tc'
Numbering	KuHa E531-4000	SaHa E531-3000	MoHa E531-3000	MoHa E530-4000	KuHa E530-5000

Car 13 has one single-arm pantograph.^[3]
Cars 11 and 15 have a wheelchair space.^[3]
Car 11 has a universal design toilet.^[3]
Car 14 is designated as a mildly air-conditioned car.^[3]
Cars 13, 14, and 15 have some transverse seating bays.^[3]

Original 10-car sets (July 2005 – March 2007)

The original ten-car sets delivered without bilevel Green cars were formed as follows.^[4]

Sets K401–K406

Car No.	10	9	8	7	6	5	4	3	2	1
	← Takahagi Ueno →

Designation	Tc	T	M	M'	T'	T	T	M	M'	Tc'
Numbering	KuHa E531-0	SaHa E531-0	MoHa E531-2000	MoHa E530-2000	SaHa E530-2000	SaHa E531-2000	SaHa E531-2000	MoHa E531-1000	MoHa E530-0	KuHa E530-0

Sets K407–K411

Car No.	10	9	8	7	6	5	4	3	2	1
	← Takahagi Ueno →

Designation	Tc	T	M	M'	T'	T'	T'	M	M'	Tc'
Numbering	KuHa E531-0	SaHa E531-0	MoHa E531-2000	MoHa E530-2000	SaHa E530-2000	SaHa E530-2000	SaHa E530-2000	MoHa E531-1000	MoHa E530-0	KuHa E530-0

Cars 3 and 8 each had one single-arm pantograph.
Cars 1 and 10 had a wheelchair space.
Cars 1, 5, and 10 each had a toilet (universal design in cars 1 and 10).
Car 8 was designated as a mildly air-conditioned car.
Cars 1, 2, 9, and 10 had some transverse seating bays.

Interior

An ordinary-class car with longitudinal seating in January 2022
An ordinary-class car with a mixture of longitudinal and transverse seating in January 2022
Priority seating in January 2022
The lower deck of bilevel Green car SaRo E531-17 in January 2022
The upper deck of bilevel Green car SaRo E531-17 in January 2022
A toilet in January 2022

History

The first E531 series trains entered service on 9 July 2005.^[5]

Pairs of double-deck "Green" (first class) cars were added to the ten-car sets from 6 January 2007, and all ten-car sets included Green cars by the start of the revised timetable on 18 March 2007. Two trailer cars from sets K401–K411 (cars 4 and 5) were repurposed as cars 6 and 9 in sets K412–K422. As there were 12 SaHa E531-2000 cars and 10 SaHa E530-2000 cars being repurposed (the latter type has an air compressor missing from the former type), the SaHa E531-2012 car was modified to become SaHa E530-2022.

In September 2014, an additional ten-car set, K423, was delivered from the J-TREC factory in Yokohama, four years after construction of the original fleet had ceased.^[6] This was followed by seven new five-car sets (K469–K475) also delivered from J-TREC in Yokohama from December 2014 to March 2015.^[7] Seven cold-weather E531-3000 series sets (K551–K557) were built between October 2015 and March 2017. Later in 2017, three more 10-car sets (K424–K426) and two more five-car sets (K476 and K477) were built. Then, between 2019 and 2020, six more five-car sets (K478–K483) were built.

On 26 March 2021, set K417 was involved in a collision between Tsuchiura and Kandatsu. It collided with a passenger vehicle which caught fire and caused damage to the KuHa E531-17 car (car 10).^[8] The damaged car was replaced with car 10 (KuHa E531-9) from set K409, which later received a new-build end car, also numbered KuHa E531-17.^[9]^[10]

Special liveries

To celebrate the 60th anniversary of the Katsuta Depot, set K451 entered service on 5 November 2021 in a wrapping reminiscent of the livery of the 401 series trains.^[11] Set K423 also received this wrapping in March 2023. The two sets are scheduled to carry this livery until the first quarter of 2026.^[12]

References

^ JR全車輌ハンドブック2009 [JR Rolling Stock Handbook 2009]. Japan: Neko Publishing. 2009. ISBN 978-4-7770-0836-0.
^ "E531系一般形交直流電車の概要" [E531 series AC/DC EMU outline]. Railway Journal. 39 (465): 102. July 2005.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s JR電車編成表 2019冬 [JR EMU Formations – Winter 2019]. Japan: Kotsu Shimbunsha. 14 November 2018. ISBN 978-4-330-93218-7.
^ JR電車編成表 '07冬号 [JR EMU Formations – Winter 2007]. Japan: JRR. December 2006. p. 47. ISBN 978-4-88283-046-7.
^ JR電車編成表 2012夏 [JR EMU Formations – Summer 2012]. Japan: Kotsu Shimbunsha. May 2012. p. 44. ISBN 978-4-330-28612-9.
^ "常磐線E531系が4年ぶりに新造される" [New E531 series built for first time in 4 years]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 1 October 2014. Archived from the original on 1 October 2014. Retrieved 1 October 2014.
^ E531系K469編成総合車両製作所出場 [E531 series set K469 delivered from J-TREC]. RM News (in Japanese). Japan: Neko Publishing Co., Ltd. 19 December 2014. Archived from the original on 19 December 2014. Retrieved 19 December 2014.
^ "JR常磐線衝突事故車は直前まで警察の追跡受け逃走中" [JR Jōban Line Collision: car was on the run from police until just before the accident]. 26 March 2021. Archived from the original on 26 March 2021. Retrieved 27 March 2021.
^ クハE531-17が甲種輸送される [KuHa E531-17 to be delivered]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 2 February 2024. Archived from the original on 2 March 2024. Retrieved 2 March 2024.
^ E531系K409編成が出場 [E531 series set K409 on test]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 2 March 2024. Archived from the original on 2 March 2024. Retrieved 2 March 2024.
^ "E531系K451編成に「赤電」ふうラッピング". Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 7 November 2021. Archived from the original on 7 November 2021. Retrieved 30 November 2021.
^ E531系K423編成，前面が赤電塗装になり出場 [E531 series set K423 with "electric red" livery at front]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 24 March 2023. Archived from the original on 2 June 2023. Retrieved 2 March 2024.