JNR Class EF63

Infobox Locomotive
name=EF63
electricsystem=1,500 V DC
tractionmotors=DC
powertype=Electric


caption= A pair of EF63s leading a 489 series EMU on a "Hakusan" service in June 1997
builddate=1962 - 1976
builder= Kawasaki, Mitsubishi and Tōshiba
weight=108 tons
uicclass=Bo-Bo-Bo
gauge=1,067 mm
firstrundate=
disposition=All withdrawn
numinclass= 25
wheeldiameter=1,120 mm
poweroutput=2,550 kW
wheelbase=
tractiveeffort= 23,400 kg
topspeed= 100 km/h
length=18.050 mm
width=2,800 mm
height=4,060 mm
transmission=
railroad=JNR, JR East, JR Freight|

The JNR Class EF63 is a class of 1,500 V DC electric locomotives formerly operating in Japan.

History

A total of 25 Class EF63 locomotives were built between 1962 and 1976 exclusively for use as bankers on the steeply-graded Usui Pass section of the Shinetsu Main Line between Yokokawa and Karuizawa. They replaced the Class ED42 electric locomotives previously used on the rack-and-pinion line between these two stations.

The prototype, EF63 1, was produced in 1962 by Toshiba for testing before full production of the class started in 1963 spread between manufacturers Kawasaki, Mitsubishi and Toshiba. The class was equipped with a number of special safety features to cope with the unique conditions of operating on the 66.7‰ gradient of the Usui Pass. These included independent dynamic brakes on all six axles (hence the large louvres along the bodysides for heat dissipation), magnetic adhesion brakes operating directly on the rails, and mechanical locking brakes. Small wheels attached to the centre bogie were used to measure the train speed and apply the brakes in the case of run-away. The class used the same 425 kW MT52 traction motors used on the EF62s and also the EF70s.The entire class was based at Yokokawa depot, and they were always used in pairs at the Yokokawa end of trains travelling in both directions, and were capable of operating in multiple with Class EF62 locomotives and a wide range of EMU types (including 115, 185, 189, 489 series) – hence the impressive array of jumper cables and connectors on the Karuizawa ends of the locos. Trains ascending the incline from Yokokawa were driven by the driver in the rearmost cab of the EF63 pair at the rear of the train, with the driver in the front cab of the train acting only as signal look-out.

Locos EF63 5 and EF63 9 were written off after a runaway derailment also involving two EF62s in 1975, and EF63 24 and EF63 25 were additionally built in 1976 to replace these two.

In 1978, EF63 11 and 13 were specially turned out to work an imperial train over the Usui Pass.

Following privatization of JNR, the entire fleet was transferred to JR East operation with the exception of EF63 1 and 14 operated by JR Freight.

The closure of the Yokokawa to Karuizawa section of the Shinetsu Main Line in September 1997 coinciding with the opening of the new Nagano Shinkansen marked the end of the careers of the EF63 locomotives. Before their final withdrawal, however, a number of locos (EF63 18, 19, 24, and 25) were repainted into original brown livery following their last overhauls in 1997. Incidentally, these locomotives were delivered in standard blue livery from new.

Locomotive histories

Batch differences

Preserved examples

* EF63 1 Usui Pass Heritage Museum, Yokokawa (brown livery)
* EF63 2 Karuizawa station
* EF63 10 Usui Pass Heritage Museum, Yokokawa
* EF63 11 Usui Pass Heritage Museum, Yokokawa (operational)
* EF63 12 Usui Pass Heritage Museum, Yokokawa (operational)
* EF63 13 Cab section only at Omiya Works
* EF63 15 Nagano depot
* EF63 18 Usui Pass Heritage Museum, Yokokawa (brown livery)
* EF63 19 Nagano depot (brown livery)
* EF63 22 Privately preserved
* EF63 24 Usui Pass Heritage Museum, Yokokawa (operational)
* EF63 25 Usui Pass Heritage Museum, Yokokawa (operational)

EF63 24 and 25 are currently used to provide driver training sessions to members of the public at the Usui Pass Heritage Museum on a short stretch of track electrified at 750 V DC (rather than the normal 1,500 V). EF63 11 and 12 are kept as operational spares. All other preserved examples are kept as static exhibits.

References

* Japan Railfan Magazine, February 2006
* Kōichi Inoue, "Kokutetsu Kikansha Jiten" (JNR Locomotive Guide), Man To Man Books, 1999
* "JR Rolling Stock Handbook 2006", Neko Publishing