Queensland 4D11½ Abt class locomotive

The Queensland Railways 4D11½ Abt class locomotive was a class of 0-4-2RT steam locomotives operated by the Queensland Railways.

Queensland Railways 4D11½ Abt class
Mount Morgan track locomotive no. 339 built by Dubs
Type and origin
Power typeSteam
BuilderDübs & Co
Serial number3619, 3620
Build date1898
Total produced2
Specifications
Configuration:
​
 • Whyte0-4-2RT
Gauge1,067 mm (3 ft 6 in)
Fuel typeCoal
Water cap.600 imp gal (2,700 L; 720 US gal)
Cylinders2
Cylinder size11.5 in × 16 in (292 mm × 406 mm)
Loco brakeWestinghouse air
Le Chatlier
Career
OperatorsQueensland Railways
Numbers339, 340
Dispositionboth scrapped

History

In October 1898, two Dübs & Co locomotives entered service. Per Queensland Railway's classification system they were designated the 4D11½ Abt class, the 4 representing the number of driving wheels, the D that it was a tank locomotive, and the 11½ the cylinder diameter in inches.

They were built to assist conventional locomotives up and down a steeply graded rack railway section of the Central Western line at Mount Morgan.[1]

Class list
Number Works
number		 In service Condemned
339 3619 October 1898 September 1916
340 3620 October 1898 December 1922

References
  1. Armstrong, John (1985). Locomotives in the Tropics Volume 1. Brisbane: Australian Railway Historical Society. pp. 66, 102. ISBN 0 909937 13 3.
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