DeRoI-class locomotive (Mitsubishi)

Chosen Government Railway DeRoI class (デロイ) Korean State Railway Chŏngisŏ class (전기서) Korean National RR Dero3 class (데로3)
Builder's photo of DeRoI-33
Type and origin Power type Electric Designer Shinichi Matsuda, Saneyoshi Hirota Builder Mitsubishi Build date 1946
Specifications Configuration: ​  • UIC 1C-C1 Gauge 1,435 mm (4 ft 8+1⁄2 in) Wheel diameter 1,370 mm (54 in) Trailing dia. 860 mm (34 in) Wheelbase: ​  • Axle spacing (Asymmetrical) 1-2: 2,050 mm (6 ft 9 in) 2-3: 1,880 mm (6 ft 2 in) 3-4: 2,600 mm (8 ft 6 in) Pivot centres 9,780 mm (32 ft 1 in) Length: ​  • Over body 16,000 mm (52 ft 6 in) Width 3,100 mm (10 ft 2 in) Height: ​  • Pantograph 4,600 mm (15 ft 1 in)  • Body height 4,050 mm (13 ft 3 in) Loco weight 138.5 t (305,000 lb) Electric system/s 3,000 V DC Current pickup(s) Pantographs Traction motors 6x MB-279-AFV ​  • Continuous 350 kW (470 hp) Gear ratio 19:78=1:4.11 Loco brake Regenerative Train brakes Elnar air brake, hand brake Compressor 2x MC1 1,700 L (450 US gal)/min Couplers AAR knuckle
Performance figures Maximum speed 75 km/h (47 mph) Power output 2.25 MW (3,020 hp) Tractive effort 170.81 kN (38,400 lbf)
Career Operators Chosen Government Railway Korean National Railroad Korean State Railway Class CGR: デロイ DeRoI KNR: 데로3 Dero3 KSR: 전기서 Chŏngisŏ Number in class 3 Numbers CGR: デロイ31 - デロイ33 KNR: 데로3-1 - 데로3-3 KSR: 전기서1 - 전기서3

The Mitsubishi DeRoI-class (Japanese: デロイ) was a group of three boxcab-style electric locomotives with regenerative braking (type EL14AR^[1]) and the capability for multiple-unit control manufactured by Mitsubishi in 1946.^[2] They were very similar to the Toshiba-built DeRoI-class locomotives and the DeRoNi-class locomotives built by Hitachi. They were built for the Chosen Government Railway (Sentetsu), but the war ended before delivery took place. They were delivered to the Korean National Railroad after the partition of Korea, which designated them 데로3 ("Dero3").^[3] During the Korean War all were captured by the Korean People's Army and taken to North Korea, where they were put into service by the Korean State Railway as the Chŏngisŏ (Korean: 전기서, "Electric 3") class.