NSB Di 4
NSB Di 4
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| Performance figures |
| Maximum speed |
140 km/h (87 mph) |
| Power output |
2,450 kW (3,290 hp) @ 900 RPM |
| Tractive effort |
360 kN (81,000 lbf) |
|
|
|
| Performance figures |
| Maximum speed |
140 km/h (87 mph) |
| Power output |
2,450 kW (3,290 hp) @ 900 RPM |
| Tractive effort |
360 kN (81,000 lbf) |
NSB Di 4 is a class of five diesel-electric locomotives built by Henschel for the Norwegian State Railways (NSB). Delivered in 1981, the class is used to haul passenger trains on the Nordland Line and are since 2001 the only revenue diesel locomotives used by NSB. The locomotives had electric components from Brown, Boveri & Cie and a 16-645E prime mover from Electro-Motive Division. This gives a power output of 2,450 kilowatts (3,290 hp) and a starting tractive effort of 360 kilonewtons (81,000 lbf).
The locomotives were ordered in the late 1970s as a supplement and later replacement of the Di 3. The class is technically similar to Denmark's DSB Class ME; it was planned to have commonalities with NSB's electric El 17 locomotives, but this was scrapped. The Di 4 was world's first asynchronous locomotive in revenue service. A second batch was planned delivered later in the 1980s, but the order was never placed.
During the 1950s and 1960s, NSB took delivery of thirty-five Di 3 locomotives. The long term plan during the 1960s called for an additional orders of Di 3s during the early 1970s, but this was never carried through. Instead, the state railways started planning of a new class. Construction was conducted by Kassel, Germany–based Henschel. The electric components were delivered by Brown, Boveri & Cie of Mannheim, Germany, while the engine-generator was delivered by General Motors. The Di 4 is technically similar to the Denmark's DSB Class ME. Di 4 was the first NSB locomotive to have three-phase and asynchronous motors, and the world's first asynchronous locomotive in revenue service. Henschel was also building the NSB El 17; the two types were planned to use the same traction motors and rectifiers to increase commonality. This was however was discarded because the Di 4's components were too heavy for the El 17.
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