JNR Class EF81
JR Freight EF81 87 in August 2007
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| Type and origin | |
|---|---|
| Power type | Electric |
| Builder | Hitachi, Mitsubishi |
| Build date | 1968–1992 |
| Total produced | 161 |
| Specifications | |
|---|---|
| UIC class | Bo-Bo-Bo |
| Gauge | 1,067 mm (3 ft 6 in) |
| Bogies | DT138 (outer), DT139 (centre) |
| Wheel diameter | 1,120 mm (3 ft 8 in) |
| Length | 18,600 mm (61 ft 0 in) |
| Width | 2,900 mm (9 ft 6 in) |
| Height | 4,280 mm (14 ft 1 in) |
| Loco weight | 100.8 t |
| Electric system(s) | 1,500 V DC / 20 kV AC (50/60 Hz) |
| Current collection | PS22 pantograph |
| Traction motors | MT52A x6 |
| Safety systems | ATS-SF |
| Performance figures | |
|---|---|
| Maximum speed | 110 km/h (70 mph) |
| Power output | 2,550 kW (3,420 hp) (on DC) 2,370 kW (3,180 hp) (on AC) |
| Career | |
|---|---|
| Operators |
|
| Number in class | 44 (as of 1 April 2016[update]) |
| Delivered | 1968 |
| Preserved | 4 |
| Disposition | In service |
The Class EF81 is a six-axle Bo-Bo-Bo wheel arrangement multi-voltage AC/DC electric locomotive type operated on passenger and freight services in Japan since 1968. As of 1 April 2016[update], 44 locomotives remained in service, operated by JR Freight, JR East, and JR West.
152 locomotives were built from 1968 to 1979 in three batches and numbered EF81 1 to EF81 152. 14 EF81-0 locomotives were later modified to become Class EF81-400. The prototype locomotive, EF81 1, was built by Hitachi, and delivered in 1968. Locomotives EF81 137 onward were built with sun-visor plates above the cab windows. These were also subsequently retro-fitted to locomotives EF81 133 to 136.
The prototype, EF81 1, was withdrawn on 31 March 2004.
From May 2012, JR Freight locomotives not fitted with driving recording units mandated for operations over 100 km/h (60 mph) were renumbered by adding "600" to the running number to differentiate them from the other members of the sub-class fitted.
As of 1 April 2016[update], 18 Class EF81-0 locomotives remained in service, operated by JR East and JR West.
EF81 2 (first batch) with white stripes indicating refurbishment in March 2008
EF81 92 (second batch) in Cassiopeia livery in September 2007
EF81 142 (third batch)
Four locomotives were built between 1973 and 1975 by Hitachi with unpainted corrugated stainless steel bodies for use on services through the undersea Kanmon Tunnel to Kyushu. In 1978, locomotives EF81 301 and 302 were transferred to the Joban Line in 1978, and received the standard JNR AC/DC livery of pale red.
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