SCOA-P wheel

History

SCOA-P wheels were developed in the late 1940s by the Steel Company of Australia Ltd (the P in the acronym standing for F. C. Paynter, who patented the design){{cite book |name-list-style=amp | title=Hudson Power

Comparative performance

The SCOA-P wheel centre of a 73-inch R class driving wheel weighed only 1,829 lb, 322 lb lighter than a Boxpok design of the same diameter and equivalent strength. Using a 100 long ton vertical press, load testing was conducted of the strength and elasticity of the SCOA-P wheel centre against a 2,021 lb conventional spoked driving wheel centre of an A2 class locomotive that had the same diameter, but was engineered for a lower 17.5 long ton axle load). The tests revealed that the SCOA-P wheel was still elastic at 23.4 long ton, with a permanent set occurring at about 30 long ton, whereas the conventional spoked wheel experienced permanent set at 20 long ton.

Use

thumb|SCOA-P driving wheels on [[Victorian Railways R class]] [[4-6-4]] steam locomotive R 761. SCOA-P wheels were used on Victorian Railways' R class 4-6-4 and J class 2-8-0 locomotives, introduced in 1951 and 1954 respectively. They were also used on the Queensland Railways BB18¼ class 4-6-2 and Tasmanian Government Railways M class 4-6-2 and H class 4-8-2.

Because the Vulcan Foundry, which built the VR J class, built SCOA-P wheeled locomotives for export until ceasing steam locomotive production in 1956, this wheel type was also seen in many of Vulcan's other export markets.

SCOA-P wheel centres were found on locomotives for the Gold Coast Railway in Africa (WM and YL classes), East African Railways (30 and 31 classes), Iran Railways' 2-10-2 Decapod, and a class of Indian Government Railways' 2-8-4T tank locomotives, among others.

References

References

1. {{harvnb. Carlisle. Hudson Power
2. [http://www.australiansteam.com/tgr.htm australiansteam.com Tasmanian Preserved Steam Locomotives] - retrieved 30 October 2006
3. [http://www.greywall.demon.co.uk/rail/Kenya/htxt/loc09.htm Nairobi Railway Museum - 3020 Nyaturu] - retrieved 30 October 2006
4. [http://www.greywall.demon.co.uk/rail/Kenya/htxt/loc10.htm Nairobi Railway Museum - 3123 Bavuma] - retrieved 30 October 2006
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