Queensland Railways 3900 class

The 3900 class are a class of electric locomotives built by Walkers Limited, Maryborough for Queensland Rail between 1988 and 1990.

Queensland Rail 3900 class
3917 and another haul a northbound freight train on the North Coast line in 1989.
Type and origin
Power typeElectric
BuilderWalkers Limited, Maryborough
ModelJA39-3B
Build date1988–1990
Total produced30
Number rebuilt19
Specifications
Configuration:
​
 • UICBo-Bo-Bo
Gauge1,067 mm (3 ft 6 in)
Length20.02 m (65 ft 8 in)
Width2.8 m (9 ft 2 in)
Height3.89 m (12 ft 9 in)
Loco weight109.8 t (108.1 long tons; 121.0 short tons)
Electric system/s25 kV AC overhead lines
Current pickup(s)Pantograph
Traction motorsASEA
Train brakesDavies & Metcalfe P85
Performance figures
Maximum speed100 km/h (62 mph)
Tractive effort2,890 kW (3,880 hp)
Career
OperatorsQueensland Rail
Class3900
Number in class30
Numbers3901–3930
Delivered1988
Current ownerAurizon

History

In July 1984, a joint venture of Clyde Engineering and Walkers Limited was awarded a contract to build 70 3500/3600 class electric locomotives with ASEA supplying the electrical equipment. These were ordered to operate coal trains on the Blackwater and Goonyella railway lines that were in the process of being electrified.[1] The contract was later extended to 80.

The bodies being built and assembled at Walkers's Maryborough factory with Clyde Engineering responsible for some of the electrical equipment and commissioning the locomotives.[2]

Following the decision to electrify the North Coast line from Brisbane to Rockhampton, the last 30 were built to a modified design for passenger and general freight use, and delivered as the 3900 class. They received modified bodies to allow them to pass through Brisbane's tunnels and received higher gearing to allow them to operate at 100 km/h (62 mph).[2][3]

3550 class

With an increased need for locomotives on the Central Queensland coal lines, 19 were converted to 3550 class locomotives.[4]

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References
  1. Oberg, Leon (2010). Locomotives of Australia 1850s-2010s. Kenthurst: Rosenberg Publishing. pp. 403–405. ISBN 9781921719011.
  2. Clark, Peter (2012). An Australian Locomotive Guide. Rosenberg Publishing. pp. 353–354. ISBN 9781921719554.
  3. Walkers/ABB 3900 Class Queensland's Railways Interest Group
  4. 3500/3600/3551 Class Railpage
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