Tasmanian Government Railways Za class

Tasmanian Government Railways ZA class
ZA class locomotive at Bell Bay in February 1978
Type and origin Power type Diesel-electric Builder English Electric Rocklea Serial number A.259 to A.262, A.278 to A.279 Build date 1973-1976 Total produced 6
Specifications Configuration: ​  • UIC Co-Co Gauge 1,067 mm (3 ft 6 in) Wheel diameter 3 ft 1+1⁄2 in (0.953 m) Wheelbase 39 ft 11 in (12.167 m) total, 11 ft 3 in (3.429 m) bogie Length 52 ft 9 in (16.078 m) over headstocks Height 12 ft 7 in (3.835 m) Axle load 16 long tons (16.3 t; 17.9 short tons) Loco weight 96 long tons (97.5 t; 107.5 short tons) Fuel type Diesel Fuel capacity 1,400 imp gal (6,400 L) Prime mover English Electric 12CSVT Mk III Engine type four stroke, four valves per cylinder Aspiration turbocharged, intercooled Alternator Toyo WD10314A Traction motors EE558 Cylinders 12 Vee Cylinder size 10 in × 12 in (254 mm × 305 mm) MU working 110V, stepless electro-pneumatic throttle Loco brake Air, proportional control, dynamic Train brakes Vacuum, converted to air 1982-1985) Westinghouse M6A then M9A
Performance figures Maximum speed 60 miles per hour (97 km/h) Power output 2,550 hp (1,900 kW) gross, 2,350 hp (1,750 kW) net Tractive effort 54,000 lbf (240.2 kN) at 13.3 mph (20 km/h)
Career Operators Tasmanian Government Railways Number in class 6 Numbers Za1-Za6 Delivered Za 1 to Za 4 July 1973, Za 5 & Za 6 1976 First run 10th July 1973 Withdrawn May 2014 Preserved 2 Current owner TasRail, Don River Railway & Tasmanian Transport Museum Disposition 1 stored, 2 preserved, 3 scrapped

The Za class are a class of diesel locomotives built by English Electric Rocklea for the Tasmanian Government Railways in 1973.