The is a commuter electric multiple unit

Electric multiple unit

An electric multiple unit or EMU is a multiple unit train consisting of self-propelled carriages, using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages...

 operated by the Odakyu Electric Railway

Odakyu Electric Railway

, or OER, is a major railway company based in Tokyo, Japan best known for its Romancecar series of limited express trains from Tokyo to Odawara, Enoshima, Tama New Town, and Hakone....

 in Japan since 1969.

4-car sets

Designation	Tc1	M1	M2	Tc2
Numbering	5050	5000	5100	5150

The M1 and M2 cars each have one single-arm pantograph.

6-car sets

Designation	Tc1	M1	M2	M3	M4	Tc2
Numbering	5250	5200	5300	5400	5500	5550

The M2 and M4 cars each have one single-arm pantograph.

History

The 5000 series was introduced from 1969, with a total of 15 sets (60 vehicles) built. These were augmented from 1978 by 20 6-car sets (120 vehicles), classified as 5200 series.

4+6-car formations were gradually replaced by new 4000 series

Odakyu 4000 series

The is a commuter electric multiple unit operated by the Odakyu Electric Railway in Japan since 2007.The first train was delivered in May 2007, and the trains entered service in September 2007 on inter-running services between Odakyū and the Tōkyō Metro Chiyoda Line, displacing 1000 series sets,...

sets, and the last remaining 6-car sets are scheduled to be withdrawn following the last day of operations on 30 January 2011. The 4-car sets will continue to operate into 2011.