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The JNR Class DD21 was a diesel-hydraulic locomotive operated by the Japanese National Railways from 1963 to 1986.

History[]

The DD21 was a prototype snow-clearing locomotive used by the JNR. One locomotive was built by Nippon Sharyo in 1963, based on DD20 1, another prototype locomotive built around the same time by Nippon Sharyo.

DD21 1 was deployed at Higashi-Niigata Rolling Stock Depot for trial runs; mass production of the DD21 was abandoned when it was discovered that seeing out the locomotive's windows was difficult when clearing snow as well as the heavy axle load making it difficult for the locomotive to enter certain lines. As a result, only DD21 1 was produced.

The locomotive was mainly used in the Niigata region but similar to the DD20 the locomotive was not used often and was withdrawn around 1986. DD21 1 was scrapped in 1992 when a new facility within the depot was being constructed.

Design[]

The DD21 featured a steeplecab-like design similar to most switcher locomotives.

Specifications[]

The DD21 was fitted with a single V12 prime mover, designated the DML61S. Being based on DD20 1, it used many parts from the DD51, such as the prime mover and the Voith DW2A hydraulic transmission.

Similar to many of JNR's other snow-clearing locomotives, the snowplow was a Russell-type snowplow. Unlike most of JNR's other snow-clearing locomotives, DD21 1's snowplow was permanently attached to the locomotive and a coupler attached to the snowplow; the idea was for the locomotive to be able to perform switching duties with the snowplow attached so that there was no need to have the snowplow removed just to perform switching duties during periods with little or no snow.

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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