The South Australian Railways 500 class was a class of 4-8-2 steam locomotives operated by the South Australian Railways. They were rebuilt as 4-8-4s.

South Australian Railways 500 Class
South Australian Railways 500 Class Locomotive No. 502 "James McGuire", c. 1926
Type and origin Power type Steam Designer Fred Shea Builder Armstrong Whitworth Serial number 633-642 Build date 1925 Total produced 10 Rebuilder Islington Railway Workshops Rebuild date 1929-1936 Number rebuilt 10
Specifications Configuration: ​  • Whyte 4-8-2 2′D1′ 2′2′ (as built) 4-8-4 2′D2′ 2′2′ (rebuilt) Gauge 5 ft 3 in (1,600 mm) Leading dia. 33 in (838 mm) Driver dia. 63 in (1,600 mm) Trailing dia. 36 in (914 mm) 42 in (1,067 mm) Length 83 ft 11 in (25,578 mm) (as built) 84 ft 2 in (25,654 mm) (rebuilt) Height 13 ft 11+1⁄2 in (4,254.5 mm) Axle load 22 long tons 7 hundredweight 2 quarters (25.06 short tons; 22.73 t) (as built) 222 long tons 3 hundredweight (24.8 short tons; 22.5 t) (rebuilt) Adhesive weight 88.85 long tons (99.51 short tons; 90.28 t) (as built) 87.20 long tons (97.66 short tons; 88.60 t) (rebuilt) Loco weight 135.80 long tons (152.10 short tons; 137.98 t) (as built) 143.80 long tons (49.06 short tons; 44.50 t) (rebuilt) Tender weight 85.15 long tons (95.37 short tons; 86.52 t) (as built) 78.80 long tons (88.26 short tons; 80.06 t) (rebuilt) Total weight 218 long tons 13 hundredweight (244.9 short tons; 222.2 t) (as built) 222 long tons 6 hundredweight (249.0 short tons; 225.9 t) (rebuilt) Fuel type Coal Fuel capacity 12 long tons (13 short tons; 12 t) (as built) 11 long tons (12 short tons; 11 t) (rebuilt) Water cap. 8,300 imperial gallons (10,000 US gal; 38,000 L) as built (Water capacity reduced to 7,100 imperial gallons (8,500 US gal; 32,000 L) in 1930) 7,000 imperial gallons (8,400 US gal; 32,000 L) (rebuilt) Firebox:  • Firegrate area 66.6 sq ft (6.19 m2) Boiler pressure 200 psi (1,379 kPa) Heating surface:  • Tubes and flues 3,253 sq ft (302.2 m2)  • Firebox 395 sq ft (36.7 m2) Superheater: ​  • Heating area 835 sq ft (77.6 m2) Cylinders 2 Cylinder size 26 in × 28 in (660 mm × 711 mm) Valve gear Walschaerts valve gear Valve type Piston
Performance figures Tractive effort 51,000 lb (23,000 kg) (as built) 59,000 lb (27,000 kg) (rebuilt) Factor of adh. 4
Career Operators South Australian Railways Class 500 Number in class 10 Numbers 500-509 First run 22/5/1926 Last run 11/5/1963 Withdrawn 1958-1963 Preserved 504 Scrapped 1961-1965 Disposition 1 preserved, 9 scrapped

History

The 500 class were part of larger order for 30 steam locomotives placed with Armstrong Whitworth, England, in 1924, as part of the rehabilitation of the state's rail system being overseen by Railways Commissioner William Webb. They replaced the Rx and S class locomotives, many dating back to 1894, that were still performing mainline duties, meaning that double and even triple heading was common. All ten 500-class locomotives arrived in Adelaide in 1926, and entered service on the Adelaide to Wolseley line as far as Tailem Bend. All were named after notable South Australians.[1]

Rebuilding

In May 1928, 506 was experimentally fitted with a booster, included in a newly created four wheel trailing truck. This American-inspired modification proved highly successful, increasing the locomotive's tractive effort from 51,000 pounds-force (230 kN) to 59,000 pounds-force (260 kN). This modification was subsequently fitted to the nine remaining locomotives, resulting in the class becoming the 4-8-4 class 500B.

Throughout the mid-1930s all but two of the locomotives in the class were semi-streamlined and had valances fitted. The first two 500-class locomotives were withdrawn from service in 1955 and the last was withdrawn in 1962.[1]

504 is preserved as a static exhibit at the National Railway Museum, Port Adelaide.[2]

Class list

References

Further reading

• Douglas Colquhoun; Ronald Stewien; Adrian Thomas (1969). 500 The 4-8-2 and 4-8-4 Locomotives of The South Australian Railways. Australian Railway Historical Society, SA.
• David Burke (2000). Giants of Steam. Australian Railway Historical Society, NSW.
• Leon Oberg (2007). Locomotives of Australia. Rosenberg Publishing, NSW.
• Ron Stewien (2011). A History of the South Australian Railways, Volume 5: Controversy and Mr Webb. Eveleigh Press, NSW.
• Ron Stewien (2010). A History of the South Australian Railways, Volume 6: Mountains, Mikados and Pacifics. Eveleigh Press, NSW.
• Drymalik, Chris. "Broad Gauge 500-class 4-8-2 (later 500B-class 4-8-4) locomotives". comrails.com. Retrieved 19 March 2013.