JNR Class DD40

The JNR Class DD40 was a diesel-hydraulic locomotive operated by the Japanese National Railways from May 1956 to March 1962.
==History==
The DD40 was a prototype diesel-hydraulic locomotive used by the JNR, with a single locomotive prototyped while the company developed its own locomotives for domestic sales as well as potentially for export. A total of ten locomotives were prototyped; these were Hitachi's DF90, DF91 and DF93, Kawasaki's DF40, Kisha Seizō's DF41, Nippon Sharyo's DD42 and DD93, Shin-Mitsubishi's DD40 and DD91 and Toshiba's DD41.
Numbered DD40 1, the locomotive was built by Shin-Mitsubishi Jukōgyō in 1956 and used as a switcher locomotive. Deployed at the Umekoji roundhouse, the locomotive was used to perform switching duties and other light duties; in 1958 the locomotive was reclassified as the Class DD92 and renumbered DD92 1. Some time afterwards the locomotive appears to have been renumbered back to DD40 1 before the loan agreement expired in March 1962 and the locomotive returned to Mitsubishi and presumably scrapped afterwards.
==Design==
The DD40 featured a steeplecab-like design similar to most switcher locomotives.
==Specifications==
The DD40 was fitted with a single Sulzer 6LDA22 I6 prime mover manufactured under license by Shin-Mitsubishi, mated to a Shin-Mitsubishi MTV332 hydraulic transmission. The prime mover produced about 665 PS (489 kW).
Category:JR Group trains
Category:B-B locomotives
Category:Diesel locomotives
Category:Diesel-hydraulic locomotives
Category:Mitsubishi locomotives
Category:Japanese locomotives
Category:Scrapped diesel locomotives
Category:Prototype locomotives
Category:Built in 1954