| Class: | NB (diesel) |
| Builder: | Commonwealth Railways, Port Augusta
Workshops |
| Introduced: | 1957 |
| Number in Class: | 1 |
| Model: | |
| Wheel Arrangement: | C |
| Engine: | Manufacture: | GM |
| | Model: | 6/71 |
| Cylinders: | Number: | 6 in line (two stroke) |
| | Bore & stroke: | 4¼ in. x 5 in. |
| Horsepower: | 140 at 1700 rpm |
| Gear ratio: | 46:15 |
| Tractive Effort | Starting: | 10,080 lbs |
| Length (over coupling points): | 21 ft. 6 in. |
| Maximum Axle Load: | 6 tons |
| Total weight: | 18 tons |
| Fuel Capacity: | 114 gallons |
| Maximum Speed: | 20 mph |
| Hydraulic Transmission: | Allison Series 600 |
| Hydraulic Final Drive: | David Brown |