Queensland 4D11½ Abt class locomotive

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

Queensland Railways 4D11½ Abt class
Type and origin
Power typeSteam
BuilderDübs & Co
Serial number3619, 3620
Build date1898
Total produced2
Specifications
Configuration:
​
 • Whyte0-4-2T
Gauge1,067 mm (3 ft 6 in)
Fuel typeCoal
Water cap600 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
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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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