251 series

251 series
A 251 series train on a Tōkaidō Main Line Super View Odoriko service
In service	April 1990–Present
Manufacturer	and Kinki Sharyo
Refurbishment	2002–2004
Number built	40 vehicles (4 sets)
Formation	10 cars per trainset
Fleet numbers	RE1–4
Operator(s)	JR East
Depot(s)	Tamachi
Line(s) served	Tokaido Main Line
Specifications
Car body construction	Steel
Car length	20,000 mm (65 ft 7 in)
Width	2,950 mm (9 ft 8 in)
Doors	Plug doors: 1 per side
Maximum speed	120 km/h (75 mph)
Traction system	Resistor control + field system superimposed field excitation control
Electric system(s)	1,500 V DC overhead catenary
Safety system(s)	ATS-SN, ATS-P
Track gauge	1,067 mm (3 ft 6 in)

The 251 series (251系^?) is a DC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) on Tokaido Line Super View Odoriko limited express services in Japan since April 1990.

The 251 series sets are primarily used on Super View Odoriko limited express services from Tokyo, Ikebukuro, and Shinjuku to Izukyu Shimoda.

Since the 13 March 2004 timetable revision, 251 series sets are also used on the weekday morning Ohayō Liner Shinjuku 26 and weekday evening Home Liner Odawara 23 services.

The four sets, numbered RE1 to RE4 and based at Tamachi Depot in Tokyo, are formed as follows, with car 1 at the Izukyū-Shimoda end, and car 10 at the Tokyo and Shinjuku end.

Cars 4, 6, and 8 are each fitted with one PS27 scissors type pantograph.

KuRo 250 (car 1)

SaRo 251 (car 2)

MoHa 250 (car 3)

MoHa 250-100 (car 5)

MoHa 251 (car 8)

SaHa 251 (car 9)

KuHa 251 (car 10)

A PS27 pantograph on a 251 series set in August 2016

Children's play area on the lower deck of a KuHa 251 car

Built by Kawasaki Heavy Industries and Kinki Sharyo, the first two sets were introduced from 28 April 1990. These were followed by two more sets in 1992.