Specifications
The Di 3 was built by Nydquist och Holm of Trollhätten, Sweden, as part of a series of GM EMD AA16 locomotives in Europe. They are technically similar to the DSB Class MY of Denmark and the MAV M61 of Hungary. The locomotives are powered by a 16-cylinder EMD 16.567 C or E engine that has a power output of 1,305 kilowatts (1,750 horsepower) at 835 revolutions per minute (rpm). The engines power an EMD D32 or D12 generator that feeds six ASEA LJB76 or LJB84 motors on a Di 3a. The Di 3b is equipped with four EMD D40 or D77B motors. This gives a tractive effort of 265 kilonewtons (60,000 lbf) for the a-series and 176.5 kilonewtons (39,700 pounds-force) for the b-series. The motors have a power output of 1,100 kilowatts (1,500 horsepower). The maximum speed is 105 kilometres per hour (65 mph) for the a-series and 143 kilometres per hour (89 miles per hour) for the b-series.
The steel bodies are 18.60 or 18.90 metres (61.0 or 62.0 ft) long. The longer length is for the three b-series units and the two a-series locomotives that were made in the batch, originally intended for VR. The a-series has a Co'Co' wheel arrangement, while the b-series has a (A1A)'(A1A)' arrangement, where the center of the three axles on each bogie is unpowered. The wheels have a 1,016 millimetres (3 ft 4.0 in) wheel diameter and the locomotives have a weight of 102.0 tonnes (100.4 long tons; 112.4 short tons) for the a-series and 103.0 tonnes (101.4 long tons; 113.5 short tons) for the b-series. The trains can be run in multiple with the Di 4, Di 6 and Di 8. All the Di 3 engines featured a bulldog nose, the only locomotive type in Norway to do so. The locomotives were at first delivered in a dark green livery, but during the 1960s this was changed to red, and the last delivered units never had a green scheme.
Read more about this topic: NSB Di 3