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The JNR Class ED74 was a Japanese AC electric locomotive operated by the Japanese National Railways from 1962 to October 1978.

History[]

The ED74 was designed specifically for use on the Hokuriku Main Line due to the use of AC electrification on that line. Manufactured to increase the number of locomotives on that line, the locomotives were intended to be able to pull trains through the Hokuriku Tunnel when it opened.

Six locomotives were built from 1962 to 1963; Mitsubishi manufactured both the mechanical and electrical equipment of the locomotive under their Shin-Mitsubishi and Mitsubishi Denki arms. Heavily based on the ED70, the locomotives were based at Tsuruga Rolling Stock Depot when introduced and used to pull passenger trains; in the late-1960s the locomotives on the line were standardized to EF70 locomotives and the locomotives were moved to Kyushu to operate on the Nippo Main Line with the 1 October 1968 timetable revision. The locomotives were based at Ōita during this time.

While they were stationed in Ōita, the locomotives were used to pull freight trains, some passenger trains such as the Fuji and Suisei and acted as towing or pusher locomotives; they could not pull standard passenger trains which required steam-generated heating as the locomotives were not equipped with a steam generator. Their axle load meant the locomotives were unable to travel south of Ōita Station; after the line was fully electrified, the locomotives were withdrawn on 2 October 1978 with the introduction of the Gōsantō timetable revision.

No ED74s have been preserved.

Design[]

The ED74s featured large box-shaped bodies with a slight rake with dual large circular headlights mounted on the top of the cars in two recesses.

Specifications[]

The ED74s used a nose suspension drive system with MT52 traction motors; the use of the nose suspension drive was due to maintenance problems involving the Quill drive, so all locomotives after the earlier EF70 would use the nose suspension drive. This however came at the cost of keeping the rated rotation speed of the traction motors low.

JR Group motive power
JNR Diesel prototype DB10DC10DC11DD10
4-axle diesel DD11DD12DD13DD14DD15DD16DD17DD20DD21DD40DD41DD42DD50DD51DD53DD54DD90DD91DD92DD93
5-axle diesel DE10DE11DE15DE50
6-axle diesel DF40DF41DF50DF90DF91 (gen 1)DF91 (gen 2)DF92DF93
Shinkansen 911912
Narrow-gauge diesel Ke DB10Ke DB11
Early 2/4-axle freight electric AB10EB10ED10ED11ED12ED13ED14ED15ED16ED17ED18 (gen 1)ED18 (gen 2)ED19ED23ED24
Early 4-axle passenger electric ED50ED51ED52ED53ED54ED55ED56ED57
Early 6-axle freight electric EF10EF11EF12EF13EF14EF15EF16EF18
Early 6-axle passenger electric EF20EF50EF51EF52EF53EF54EF55EF56EF57EF58EF59HEF10HEF50
Early 8-axle electric EH10EH50HEH50HEH150
Early Abt rack rail electric EC40ED40ED41ED42
Acquired from private railways ED20ED21ED22ED25 (gen 1)ED25 (gen 2)ED26 (gen 1)ED26 (gen 2)ED27 (gen 1)ED27 (gen 2)ED28 (gen 1)ED28 (gen 2)ED29 (gen 1)ED29 (gen 2)ED30 (gen 1)ED31ED32ED33ED34ED35ED36ED37ED38Ke ED10DeKi 1RoKo 1DeKi 501RoKo 1000
DC 4-axle ED60ED61ED62ED63ED95
AC 4-axle ED44ED45ED70ED71ED72ED73ED74ED75ED76ED77ED78ED79ED90ED91ED93ED94
DC 6-axle EF60EF61EF62EF63EF64EF65EF66EF67EF90
AC 6-axle EF70EF71
Dual-current ED30 (gen 2)ED46ED92EF30EF80EF81
Other AH100
JR Group Dual-current electric ED500EF500EF510EH500
DC electric EF200EF210EH200
DC EMU M250
AC electric EH800
Diesel DD18DD19DB500DD200DF200ENR-1000
Hybrid HD300
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