The D50 class is an old class of 2-8-0 steam locomotives built for the New South Wales Government Railways of Australia.

New South Wales D50 class
Class D50 Locomotive
Type and origin Power type Steam Builder Beyer, Peacock & Co. (151) Dübs & Co. (5) Neilson & Co. (10) North British Locomotive Co. (84) Clyde (30) Build date 1896–1916 Total produced 280
Specifications Configuration: ​  • Whyte 2-8-0  • UIC 1'Dn Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 4 ft 3 in (1,295 mm) Adhesive weight 126,000 lb (57,153 kg; 57 t) Loco weight 139,000 lb (63,049 kg; 63 t) Firebox:  • Firegrate area 30 sq ft (2.8 m2) Boiler pressure 160 psi (1.10 MPa) Heating surface 2,210 sq ft (205 m2) Superheater None Cylinders Two, outside Cylinder size 21 in × 26 in (533 mm × 660 mm)
Performance figures Tractive effort 30,576 lbf (136.0 kN) Factor of adh. 4.10
Career Operators New South Wales Government Railways Class T524, D50 from 1924 Number in class 280 Disposition 4 preserved, 276 scrapped

History

The first was delivered in May 1896 by Beyer, Peacock and Company with further orders over the next 20 years seeing the class number 280. Their second and third coupled wheel tyres were flangeless to reduce curve friction.[1][2]

During the First World War, an additional 10 locomotives of this class were under construction at the North British Locomotive Company, but these types of engines were not delivered to Australia, being taken over by the British War Office for the Royal Engineers Railway Operating Division. After the war, they were offered back to the New South Wales Government Railways at higher than new prices and in a badly worn condition. They were declined and 8 locomotives were subsequently acquired by the Nord-Belge railway [fr] in Belgium[3] and, following rebuilding, assigned to work coal trains along the Meuse Valley. The 2 other locomotives were acquired by S.A. Force, Eclairage et Docks de Gand in Ghent, Belgium.[4]

The Commonwealth Railways also chose this design to be its first goods locomotive class, building eight K-class engines, for the Trans-Australian Railway.[2]

The last 75 engines were built with superheaters and after being judged a success many of the class were retrofitted. Many engines of the class received turret type tenders in later years which provided better visibility when operating in reverse.[2]

In the 1930s, 72 engines were withdrawn and after being used during the load testing of the Sydney Harbour Bridge in 1932 with most of these locomotives being later scrapped, although 14 engines were rebuilt with superheaters and returned to service.[1] By mid-1964 there were only 113 engines left in service with the class of these kinds of engines by now normally restricted to working coal trains in the Hunter Valley and shunting duties in the larger marshalling yards throughout the system.[1][2] Several of these heavy shunters were fitted with automatic couplings on the front buffer beam from 1960 onwards.

5069 and 5132 are both preserved by Dorrigo Steam Railway and Museum at Dorrigo. 5069 and 5132 were 2 engines of the 88 locomotives used to test the Sydney Harbour Bridge before it opened. 5069 is still in its original saturated condition whilst 5132 is the only superheated 50 class engine preserved and is also fitted with the only preserved Morts Dock tender. 5096 is also a saturated version and is currently stored at Broadmeadow. 5112, also in saturated condition, was cosmetically restored at the Lithgow State Mine Heritage Park & Railway between 2005 and 2010 before being placed on static display at Bathurst; this locomotive is known as the "Chifley Engine" as it was regularly driven by future Prime Minister of Australia Ben Chifley before he entered politics. Four engines are preserved.[5]

Preservation

Gallery

• 
  5096 stored at Broadmeadow No.2 Roundhouse
• 
  5144 hauls the connection from Blayney to Cowra near Stanfield

See also

• NSWGR steam locomotive classification

References