301 series

301 series
Set K5, February 2003
In service	1966–2003
Manufacturer	Kawasaki Heavy Industries, Nippon Sharyo
Constructed	1966–1969
Scrapped	2003
Number built	56 vehicles
Number in service	None
Number preserved	1 vehicle
Formation	10 cars per trainset (originally 7 cars)
Fleet numbers	K1–5
Operator(s)	JNR (1966-1987) JR East (1987-2003)
Depot(s)	Mitaka
Line(s) served	Chūō-Sōbu Line, Eidan Tōzai Line
Specifications
Car body construction	Aluminium
Car length	20 m (65 ft 7 in)
Doors	4 pairs per side
Maximum speed	100 km/h (60 mph)
Electric system(s)	1,500 V DC
Current collection method	Overhead catenary
Safety system(s)	ATS-B/P, ATC
Track gauge	1,067 mm (3 ft 6 in)

The 301 series (301系^?) was an electric multiple unit (EMU) train type introduced in 1966 by Japanese National Railways (JNR), and later operated by East Japan Railway Company (JR East) on Chūō-Sōbu Line and Tōzai Line subway through-running services in Tokyo, Japan, until 2003.

Broadly based on the 103 series commuter EMU, the 301 series was designed specifically for use on through-running services with the Eidan Tōzai Line (present-day Tokyo Metro Tōzai Line) in Tokyo, and was the first aluminium-bodied rolling stock introduced on Japanese National Railways (JNR).

When first delivered, the sets were finished with a clear acrylic paint, giving an unpainted appearance. The sets were subsequently painted in light grey with a yellow bodyside stripe. This was later changed to a light blue ("Blue No. 22") stripe to match the Tōzai Line line colour.

For cost reasons, only 56 vehicles were built, and subsequent rolling stock built for Tōzai Line through-running services was conventional steel-bodied 103-1200 series stock.

The 301 series trains were based at Mitaka Depot in Tokyo throughout their service life, and were used on Chūō-Sōbu Line local and Tōzai Line subway through-running services.

Following reforming into 10-car sets, the fleet was formed as follows, with car 1 at the Nishi-Funabashi end and car 10 at the Mitaka end. Sets K1 and K2 included former KuHa 301 and KuMoHa 300 driving cars with driving cab equipment removed.

Cars 2, 4, 7, and 9 were each equipped with one lozenge-type pantograph.