Commonwealth Railways D class

Commonwealth Railways D Class
A Commonwealth Railways D Class, as a NSWGR Q.158 class in its rebuilt tender form.
Type and origin Power type Steam Builder Beyer, Peacock and Company Serial number 1909–1914 Build date 1880 Total produced 6 Rebuild date 1910
Specifications Configuration: ​  • Whyte 4-4-0T (as built) 4-4-0 (rebuilt)  • UIC 2′B n2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 5 ft 0+1⁄2 in (1,537 mm) Length 46 ft 6 in (14,173 mm) Loco weight 58 long tons 18 cwt (59.8 t) Fuel type Coal Fuel capacity 4 long tons 10 cwt (4.6 t) Water cap. 2,000 imp gal (9,100 L; 2,400 US gal) Firebox: ​  • Grate area 14.75 sq ft (1.370 m2) Boiler pressure 150 lbf/in2 (1.03 MPa) Cylinders Two, inside Cylinder size 16 in × 24 in (406 mm × 610 mm) Valve gear Stephenson
Performance figures Tractive effort 12,290 lbf (54.67 kN)
Career Operators New South Wales Government Railways (until 1913) Commonwealth Railways (from 1912) Delivered 1880 (NSWGR) October 1912 (CR) Withdrawn 1921–1943 Scrapped 1958–1959 Disposition All scrapped

The Commonwealth Railways D class were a class of 4-4-0 construction and shunting locomotives built in 1880 by Beyer, Peacock and Company originally for the New South Wales Government Railways as their Q.158 class, and later the Commonwealth Railways.

Construction started on a new line which went from Kalgoorlie to Port Augusta; however a need for more motive power was required and so the New South Wales Government Railways started negotiating with the Commonwealth Railways. The NSWGR had introduced their Q Class in 1880 originally as 4-4-0 side tank engines but due to excessive axle loads they were converted by the NSWGR into tender engines with 6 wheel tenders. There were 6 of them bought originally for suburban passenger work they were now surplus to requirements. So the Commonwealth Railways purchased 4 locomotives in October 1912 at the cost of £4,700. The remaining 2 were purchased soon after. All six locomotives were given automatic couplers prior to entering service but all retained their original NSWGR number. They were also reclassed as 'D'. In 1913 and 1914 the class had many problems with cracking gauge glasses and tubes blowing which slowed the progress of the construction of the Trans-Australian Line. Many more problems followed such as broken stays, side rod brasses, axle box brasses and the need for many of the class to be re-tubed this resulted in most of that class spending a lot of time in the workshops at Port Augusta. When the G/GA class was introduced the D class were relegated to shunting duties.^[1]

In the 1920s, all the D class were withdrawn but not scrapped except for D162, which was withdrawn in July 1943. The D class started being scrapped in 1958, with the last D class number 163 being scrapped on 26 March 1959.^[1]