Queensland 4D11½ Abt class locomotive

Queensland Railways 4D11½ Abt class

Mount Morgan track locomotive no. 339 built by Dubs

Type and origin
Power type	Steam
Builder	Dübs & Co
Serial number	3619, 3620
Build date	1898
Total produced	2

Specifications
Configuration:
• Whyte	0-4-2RT
Gauge	1,067 mm (3 ft 6 in)
Fuel type	Coal
Water cap.	600 imp gal (2,700 L; 720 US gal)
Cylinders	2
Cylinder size	11.5 in × 16 in (292 mm × 406 mm)
Loco brake	Westinghouse air Le Chatlier

Career
Operators	Queensland Railways
Numbers	339, 340
Disposition	both scrapped

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

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]