NSB Di 3 is a class of 35 diesel-electric locomotives built by Nydqvist och Holm (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 route of the Bergen, Dovre and Nordland Lines. During 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.
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