NSB Di 4

NSB Di 4
Type and origin
Power typeDiesel-electric
BuilderHenschel
Build date1980
Specifications
Configuration:
 • UICCo′Co′
Gauge1,435 mm (4 ft 8+12 in)
Wheel diameter1,100 mm (3 ft 7 in)
Wheelbase1,850 mm (6 ft 1 in)+2,000 mm (6 ft 7 in) (bogies
15.600 m (51 ft 2.2 in) (between outer axles)
Length20.8 m (68 ft 3 in)
Height4.35 m (14 ft 3 in)
Axle load20 t (20 long tons; 22 short tons)
Loco weight120 t (120 long tons; 130 short tons)
Prime moverEMD 16-645E3B
Traction motorsNEBB QD 335N4A
CylindersV16
Cylinder size230.2 mm × 254 mm (9.06 in × 10.00 in)
bore x stroke
TransmissionElectric
Performance figures
Maximum speed140 km/h (87 mph)
Power output2,450 kW (3,290 hp) @ 900 RPM
Tractive effort360 kN (81,000 lbf)
Career
OperatorsNorwegian State Railways SJ Norge
Number in class5
Numbers4.651 – 4.655

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 General Motors Electro-Motive Division 16-645E prime mover. 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.