The is a DC

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 numbe ...

(EMU) train type operated by the

private railway A private railway is a railroad run by a private business entity (usually a corporation but not need be), as opposed to a railroad run by a public sector. Japan In Japan, , commonly simply ''private railway'', refers to a public transit railway o ...

operator

Sagami Railway The , or , is a private railway company operating three lines in Kanagawa Prefecture, Japan. It is a wholly owned subsidiary of holding company Sotetsu Holdings, Inc. Sotetsu Holdings is listed on the Tokyo Stock Exchange; 6.58% of it is owned ...

(Sotetsu) in

Kanagawa Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Kanagawa Prefecture is the second-most populous prefecture of Japan at 9,221,129 (1 April 2022) and third-densest at . Its geographic area of makes it fifth-smallest. Kana ...

, Japan, since 1990.

Body

The trains use a lightweight aluminium body.

Interior design

Some cars have transverse seating. File:Sotetsu 8701 inside.jpg, Longitudinal seating in car 8701 in April 2012 File:Sotetsu 8000 BoxSeat.jpg, A transverse seating bay

Electrical equipment

The motor system is based on the New 7000 series. This series adopted

variable-frequency drive A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and, depending on topology, to control associated voltage or current variat ...

motors named "Hitachi HSV-03"; the motor power is 150 kW and installed as 4 motors per car. Power cars are two cars as one pair. The 8100 car establishes the VFD-controller, and the 8200 car establishes a

compressor A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps: both increase the pressure on a fluid and both can transp ...

, etc. The brake system was finished with Hitachi HSC and adopted

brake by wire In the automotive industry, brake-by-wire technology is the ability to control brakes through electrical means. It can be designed to supplement ordinary service brakes or it can be a standalone brake system. This technology is widely used on al ...

with

regenerative brake Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction mo ...

. Bogies are based on the New 7000 series, too. The name is "KH132B" (for power cars) and "KH135B" (for others).

Safety system

The safety system uses a

dead man's switch A dead man's switch (see alternative names) is a switch that is designed to be activated or deactivated if the human operator becomes incapacitated, such as through death, loss of consciousness, or being bodily removed from control. Originally a ...

and

automatic train stop Automatic train stop or ATS is a system on a train that automatically stops a train if certain situations occur (unresponsive train operator, earthquake, disconnected rail, train running over a stop signal, etc.) to prevent accidents. In some scena ...

Formation

, the fleet consists of 12 ten-car sets, formed as follows.

8701–8707

8708–8713

Key: * CONT： VFD controller (1 Controller operates 2 cars, 8 Motors. 1C8M) * MG： Motor-generator * SIV：

Inverter (electrical) A power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency obtained depends on the particular device employed. Inverters do the opp ...

* CP：

Reciprocating compressor A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. Pressures of up to 5,000 PSIG are commonly produced by multistage reciprocating ...

* PT：

pantograph A pantograph (, from their original use for copying writing) is a mechanical linkage connected in a manner based on parallelograms so that the movement of one pen, in tracing an image, produces identical movements in a second pen. If a line dr ...

* ★ Transverse seating

History

A total of 130 cars were built between 1990 and 2000 by

Hitachi () is a Japanese multinational corporation, multinational Conglomerate (company), conglomerate corporation headquartered in Chiyoda, Tokyo, Japan. It is the parent company of the Hitachi Group (''Hitachi Gurūpu'') and had formed part of the Ni ...

Yamaguchi Prefecture is a Prefectures of Japan, prefecture of Japan located in the Chūgoku region of Honshu. Yamaguchi Prefecture has a population of 1,377,631 (1 February 2018) and has a geographic area of 6,112 Square kilometre, km2 (2,359 Square mile, sq mi). Y ...

. They replaced many of the aging 6000 series and new 6000 series sets. Set 8707 was involved in a collision with a track maintenance vehicle in March 2004, at Shonandai Station, and was scrapped in 2006. The set was replaced by a newer

Sotetsu 10000 series The is an electric multiple unit (EMU) commuter train type operated by the private railway operator Sagami Railway (Sotetsu) in Japan. History The trains are based on JR East's E231 series design, and were built to replace ageing 5000, 2100, ...

set. Set 8702 was withdrawn from service on 13 March 2020 for aging reasons and due to the introduction of newly built set 12106 and was scrapped in April of the same year.

Refurbishment

Body

* The air conditioners were changed to new

freon Freon ( ) is a registered trademark of the Chemours Company and generic descriptor for a number of halocarbon products. They are stable, nonflammable, low toxicity gases or liquids which have generally been used as refrigerants and as aerosol prop ...

-based type. * Some diamond-shaped pantographs were changed to single-arm. * From 2008, the livery was changed to a new livery based on that used on the Sotetsu 10000 series. * One Set 8709 Was painted into The Yokohama Navy Blue further sets will be refurbished with new interiors and full led indicator destination

Interior design

* Some early formations do not have wheelchair space, so it was added in the 8700 and 8500 cars. * The bench seats were replaced with sculpted longitudinal seats and the seat covers were changed from orange to purple. * Both ends of the seat were attached to white partition board and a curved pole.

Safety system

* ATS was changed from original type to the same type as the

East Japan Railway Company The is a major passenger railway company in Japan and is the largest of the seven Japan Railways Group companies. The company name is officially abbreviated as JR-EAST or JR East in English, and as in Japanese. The company's headquarters are ...

. * A new safety system was established. If no control in one minute, then the emergency brake engages and the train stops. This system is named by Japan "EB".

References

{{DEFAULTSORT:Sotetsu 8000 series Electric multiple units of Japan 8000 series Train-related introductions in 1990 Hitachi multiple units 1500 V DC multiple units of Japan