Class 921/922 were formed as 7-car unit, including class 921 trailer vehicle
which was 17.5m long and had 3 bogies in order to inspect track conditions.
Class 922 were equipped with inspection domes and inspection current collectors
in order to inspect electric facilities (current feeder and signal). 2
units of class 921/922 were built. Set T2 with wide windows was built in
1974 and T3 with small windows was built in 1979.
Class 921/922 inspected the track and the electric facilities of the Tokaido-Sanyo
Shinkansen every 10 days. In the daytime class 921/922 wasn't able to run
on the Tokaido Shinkansen line, which was very busy line, because class
921/922 travelling at 210km/h was slower than other Shinkansen trains travelling
at 270km/h. JR Central decided to displace set T2 with class 923, which
can travel at 270km/h, in 2000. Set T2 was withdrawn in 2000.
Furthermore, set T5 (class 923-3000) was introduced by JR West in order
to displace remaining set T3 and set T3 was withdrawn in 2005. |
| Technical Data |
| Items |
Data |
| Built |
1973, 1979 |
| Construction |
Steel |
| Formation |
6M-1T |
| Supply voltage |
25,000VAC, 60Hz |
| Service speed, etc. |
210km/h |
| Length |
25,150mm (End cars) 25,000mm (Intermediate cars) |
| Width |
3,383mm |
| Height |
3,975mm |
| Bogie |
DT200A (motored)/TR8009, TR8010 (trailer) |
| Collector |
PS200 Cross-arm |
| Traction motor |
MT200B (185kW) |
| Gear ratio |
2.17 |
| Transformer |
TM201A |
| Controller |
CS46 |
| Air conditioner |
AU56, AU57 |
| Designed by |
Japan National Railways |
|
|
