JR East developed E231-500 series electric multiple unit (EMU) trains in
order to replace 205 series EMU used on the commuter services of Yamanote
Line, in 2001. They feature D-ATC digital automatic train control.
6 out of 11 cars are powered with AC traction motors rated at 95kW, giving
high acceleration performance rated at 3.0 km/h/s. They include two six-door
Saha E230-500 with six pairs of doors per side and bench seats that were
folded up until 10 a.m. on weekdays to provide standing room only during
the morning peak. The loudspeakers, which a train conductor uses in order
to guide passengers waiting at a station, are prepared to fit on each side
of the body. Although vehicles built in 2001 are equipped with AU725 air
conditioner rated at 42,000 kcal/h excepting Saha E230-500, all vehicles
built after 2002 are equipped with AU726 air conditioner rated at 50,000
kcal/h.
The AVAF traction system was changed into SC60B featuring the practical use of regenerative brake.
E231-500 series feature Visual Information System (VIS). Pairs of LCD passenger information screens are fitted above each door internally.
The two six-door cars in each set were subsequently replaced by a new build
of four-door trailer cars between February 2010 and August 2011, to standardize
door spacing ahead of the introduction of platform doors on all Yamanote
Line stations by 2017. The new cars were built to E233 series standards,
and the replacement cars (Saha E231-4600) for car 10 have an irregular
door spacing corresponding to the driving cars of Keihin-Tohoku Line E233-1000
series sets, which occasionally have to share the same platforms during
engineering work. Bogies of Saha E231-4600 were changed into TR255A, which
is same as that of E233 series.
Some E231-500 series excepting Saha E231-4600 were reformed as new 10-car sets and entered the commuter services of Sobu line. Saha E231-4600 were modified to Saha E235-4600 of E235 series EMU. |
|
| Technical Data |
| Items |
Data |
| Supply Voltage |
1500VDC |
| Service
speed, etc. |
Acceleration: 3.0km/h/s Service speed: 120km/h |
| Length |
19500mm |
| Width |
2950mm |
| Height |
3655mm |
| Bogie |
DT61G (motored) TR246M, N, P, TR255A (trailer) |
| Collector |
PS33 |
| Traction
motor |
MT73 (95kW) |
| Gear ratio |
7.07 |
| Traction system |
3 step AVAF control (SC60B) |
| Air conditioner |
AU725 (42000kcal/h) AU726 (50,000kcal/h) |
| Designed
by |
JR East |
|
|
