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

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 1984-1985)
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 First run June 1973 Current owner TasRail, Don River Railway & Tasmanian Transport Museum Disposition 1 stored, 2 preserved, 3 scrapped

History

With the construction of a new line from Launceston to Bell Bay, Tasmanian Government Railways placed an order for four 1752 kW locomotives with English Electric. A further two were delivered in 1976, ZA 6 being the final locomotive built by GEC Australia[1][2] and the last English Electric locomotive built anywhere. The 1976 locomotives differed from the earlier batch in having a rounded cab roof, similar to the Z class, instead of an angled roof like the 2350 class from which they were derived.

In March 1978 the Za class were included in the transfer of the Tasmanian Government Railways to Australian National. From 1982 all had their vacuum brakes replaced with air brakes.[3]

In June 1998 the five in service were renumbered as the 2114 class, ZA4 having been withdrawn.[4]

In May 2014, 2114 joined 2115 and 2118 in storage after the new TR class entered full service. 2118 (ZA6) was held for preservation with 2115 (ZA2) retained as a parts donor.

On 14 January 2021, the Tasmanian Transport Museum announced that they had managed to secure ZA6, launching a GoFundMe campaign for its restoration the following day.

ZA 1 (2114) was delivered to Don River Railway for preservation on 23 May 2022. Its preservation funded by a sole member.

Status table

See also

• Former Tasmanian Government Railways locomotives
• Locomotives of the Tasmanian Government Railways/1950

References