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 o ...
(EMU) train type introduced in 1986 by
Japanese National Railways
The , abbreviated JNR or , was the business entity that operated Japan's national railway network from 1949 to 1987.
Network Railways
As of June 1, 1949, the date of establishment of JNR, it operated of narrow gauge () railways in all 46 pre ...
(JNR) and operated by
East Japan Railway Company
The is a major passenger railway company in Japan and 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 in ...
(JR East) on through services between the Joban Line and
Tokyo Metro Chiyoda Line
The is a subway line owned and operated by Tokyo Metro in Tokyo, Japan. On average, the line carries 1,447,730 passengers daily (2017), the second highest of the Tokyo Metro network, behind the Tozai Line (1,642,378). Only one 10-car set was built, which was withdrawn in December 2009.
Design
Based on the earlier
205 series
The is a DC electric multiple unit (EMU) commuter train type introduced in 1985 by Japanese National Railways (JNR), and inherited by JR East and JR West after JNR was privatised two years later. It is currently operated by East Japan Railway ...
design, the 207-900 series was a prototype built as the first
VVVF
A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor, AC motor drive (sys ...
-controlled EMU operated by JNR. The 207 series built later by
JR West
, also referred to as , is one of the Japan Railways Group (JR Group) companies and operates in western Honshu. It has its headquarters in Kita-ku, Osaka. It is listed in the Tokyo Stock Exchange, is a constituent of the TOPIX Large70 index, ...
bears no relation to this train.
The train used adjustable voltage/adjustable frequency (AVAF)
inverters
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 op ...
and induction motors using
gate turn-off thyristor
A gate turn-off thyristor (GTO) is a type of high-power (e.g. 1200 V AC) thyristor that unlike a normal thyristor is fully controllable and can be turned On and Off by their gate lead.
It was invented by General Electric.
Device descrip ...
(GTO) components.
Formation
The sole 10-car set, numbered "71", was formed as follows, with car 1 at the Yoyogi-Uehara end and car 10 at the Toride end.
Cars 3, 6, and 9 were each fitted with one PS21 lozenge-type pantograph.
Interior
File:JNR207-interior.JPG, Interior of a 207-900 series car in September 2007
History
The train was delivered to Matsudo Depot in November 1986.
It was withdrawn from service in 2009 following the introduction of new E233-2000 series EMUs, and a final "Sayonara" service was run on 5 December 2009. The train was transferred to Nagano on 5 January 2010 for scrapping.