Design
The DFs were powered by an EMD 12-645 engine, the same prime mover chosen for the DC class, but were able to make greater use of that power by having six traction motors and Co-Co arrangement as opposed to the four traction motors and A1A-A1A wheel arrangement of the DC's. This gave the DF several advantages: a tractive effort of 198 kN (45,000 lbf) and a maximum speed of 113 km/h (70 mph), compared to the DC's 140 kN (31,000 lbf) and 90–100 km/h (56–62 mph). The most noticeable visual difference between the DF and the DC is that the DF is considerably longer with the headlight arrangement on the cabs differing: the DC has the lights arranged horizontally, while the DF has them arranged vertically. The DF is more often confused with the DX class, as both are of similar dimensions though the DX also has the horizontal headlight arrangement.
Read more about this topic: New Zealand DF Class Locomotive (1979)
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