E351 series

E351 series
E351 series EMU on a Super Azusa service, January 2010
In service	December 1993–Present
Manufacturer	Hitachi and Nippon Sharyo
Replaced	183 series
Number built	60 vehicles (10 sets)
Number in service	60 vehicles (10 sets)
Formation	4/8 cars per trainset
Fleet numbers	S1–S5, S21–S25
Operator(s)	JR East
Depot(s)	Matsumoto
Line(s) served	Chūō Main Line
Specifications
Car body construction	Steel
Car length	20,700 mm (67 ft 11 in)–21,680 mm (71 ft 2 in)
Width	2,843 mm (9 ft 3.9 in)
Doors	2 per side
Maximum speed	130 km/h (80 mph)
Traction system	MT69 (150 kW)
Power output	3,600 kW per 12-car formation
Electric system(s)	1,500 V DC overhead
Current collection method	PS31 single-arm pantograph
Bogies	DT62A (motored), TR247 (trailer)
Braking system(s)	Regenerative brake, electronically controlled pneumatic brakes, snow-resistant brake
Safety system(s)	ATS-P, ATS-Ps
Track gauge	1,067 mm (3 ft 6 in)

The E351 series (E351系^?) is a tilting electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) on Chūō Main Line Super Azusa limited express services in Japan since 1993. First introduced in December 1993 (initially on Azusa services), a total of 60 vehicles were built, formed as five 8-car main sets (numbers S1 to S5) and five 4-car supplementary (numbers S21 to S25) sets.

Built jointly by Hitachi and Nippon Sharyo, the tilting E351 series trains were intended to replace the ageing 183 series EMUs used on Azusa Limited express services operating between Shinjuku in Tokyo and Matsumoto, and to increase speeds on the highly curved Chūō Main Line.

Between 16 March 1996 and 14 March 2008, E351 series sets were also used on Tōkaidō Main Line weekday morning Ohayō Liner Shinjuku 22 and evening Home Liner Odawara 27 commuter services.

From spring 2016, the E351 series trains are scheduled to be replaced by new E353 series EMUs on Chuo Line limited express services, and will be relegated to seasonal use.

The fleet consists of five 4-car sets (S21–S25) and five 8-car sets (S1–S5), formed as shown below, with car 1 (car 5) at the Shinjuku or Tokyo end.