NSB Di 3

NSB Di 3

HK NOHAB Di 3 006 of the Kosovo Railways

Type and origin Power type Diesel-electric Builder Nydqvist och Holm Build date 1954–69

Specifications UIC class Co'Co' (a-series) (A1A)'(A1A)' (b-series) Gauge 1,435 mm (4 ft 8 1⁄2 in) Wheel diameter 1,016 mm (40 in) Length 18.6 m (61 ft 0 in) (a-series) 18.9 m (62 ft 0 in) (b-series) Loco weight 102 t (100 long tons; 112 short tons) (a-series) 103 t (101 long tons; 114 short tons) (b-series) Prime mover EMD 567 Cylinders 16 Transmission Electric

Performance figures Maximum speed 105 km/h (65 mph) (a-series) 146 km/h (91 mph) (b-series) Power output 1,305 kW (1,750 hp) Tractive effort 265 kN (60,000 lbf) (a-series) 176.5 kN (39,700 lbf) (b-series)

Career Operators Inlandsbanan AB Kosovo Railways Norwegian State Railways Ofotbanen AS Skandinaviska Jernbanor Number in class 35 Numbers 3 602 – 3 633 3 641 – 3 643

NSB Di 3 is a class of 35 diesel-electric locomotives built by NOHAB for the Norwegian State Railways (NSB). The class was built between 1954 and 1969, and delivered in two series, Di 3a and Di 3b. They are based on the Electro-Motive Division F7 and are equipped with EMD 567 engines. They have a distinct bulldog nose and were numbered 602–633 (a-series) and 641–643 (b-series). The locomotives had a prime mover that gives a power output of 1,305 kilowatts (1,750 hp). The a-series has a Co'Co' wheel arrangement, while the b-series has (A1A)'(A1A)'. The b-series has higher top speed, but lower tractive effort.

The class was the dominant locomotive on NSB's unelectrified lines. It was ordered as part of the company's dieselization of services during the 1950s and 1960s, and was initially used on the three mainline routes of the Bergen, Dovre and Nordland Lines. In the 1960s the Bergen and Dovre Lines were electrified and the Di 3 units transferred to smaller lines, such as the Meråker, Valdres, Røros, Solør and Rauma Lines. They remained in service with NSB until 2001, five years later than planned due to NSB returning their successor, the Di 6. The units are still in use by the private operator Ofotbanen, the Kosovo Railways, an operator in Sicily, and the Norwegian Railway Museum. The class is similar to the DSB Class MY and MÁV M61.