E531 series

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E531 series
An E531 series train at Kita-Senju Station

In service	2005 - Present
Formation	5/10 cars per trainset
Operator	JR East
Depots	Katsuta
Lines served	Jōban Line, Mito Line
Specifications
Car length	20,000 mm
Width	2,966 mm
Maximum speed	130 km/h
Acceleration	2.5 km/h/s
Gauge	1,067 mm
Voltage	1,500 V DC & 20 kV AC overhead
Braking system	Regenerative brake
Safety systems	ATS-SN, ATS-P, ATS-Ps

The E531 series is an electric multiple unit used by East Japan Railway Company (JR East) in Japan. It was introduced by JR East on July 9, 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 in service.

Trains are formed in 10-car (set numbers K-401 onward) and 5-car (set numbers K-451 onward) sets. 15-car formations are generally run between Ueno and Tsuchiura. 10- and 5-car sets operate singly north of Tsuchiura, and 5-car sets are used on the Mito Line.

Pairs of double-deck Green cars were added to the 10-car sets from 2007-01-06, and all 10-car sets included Green cars by the start of the revised timetable on 2007-03-18.