Diesel locomotive class
| Tasmanian Government Railways ZA class |
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 ZA class locomotive at Bell Bay in February 1978 |
| Type and origin |
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| Power type | Diesel-electric |
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| Builder | English Electric Rocklea |
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| Serial number | A.259 to A.262, A.278 to A.279 |
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| Build date | 1973-1976 |
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| Total produced | 6 |
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| Specifications |
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Configuration:
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| • UIC | Co-Co |
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| Gauge | 1,067 mm (3 ft 6 in) |
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| Wheel diameter | 3 ft 1+1⁄2 in (0.953 m) |
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| Wheelbase | 39 ft 11 in (12.167 m) total, 11 ft 3 in (3.429 m) bogie |
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| Length | 52 ft 9 in (16.078 m) over headstocks |
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| Height | 12 ft 7 in (3.835 m) |
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| Axle load | 16 long tons (16.3 t; 17.9 short tons) |
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| Loco weight | 96 long tons (97.5 t; 107.5 short tons) |
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| Fuel type | Diesel |
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| Fuel capacity | 1,400 imp gal (6,400 L) |
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| Prime mover | English Electric 12CSVT Mk III |
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| Engine type | four stroke, four valves per cylinder |
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| Aspiration | turbocharged, intercooled |
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| Alternator | Toyo WD10314A |
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| Traction motors | EE558 |
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| Cylinders | 12 Vee |
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| Cylinder size | 10 in × 12 in (254 mm × 305 mm) |
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| MU working | 110V, stepless electro-pneumatic throttle |
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| Loco brake | Air, proportional control, dynamic |
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| Train brakes | Vacuum, converted to air 1982-1985) Westinghouse M6A then M9A |
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| Performance figures |
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| Maximum speed | 60 miles per hour (97 km/h) |
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| Power output | 2,550 hp (1,900 kW) gross, 2,350 hp (1,750 kW) net |
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| Tractive effort | 54,000 lbf (240.2 kN) at 13.3 mph (20 km/h) |
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The Za class are a class of diesel locomotives built by English Electric Rocklea for the Tasmanian Government Railways in 1973.
