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Queensland Railways class C17 and Commonwealth Railways class NM
Australia | 1920 | 249 produced
No. 802 in September 2006 on the “Mary Valley Rattler” heritage railway
No. 802 in September 2006 on the “Mary Valley Rattler” heritage railway
Mary Valley Rattler

As a development of the C16, C.F. Pemberton developed the class C17. While the letter C stood for four coupled axles, the 17 indicated the cylinder diameter in inches. Production took place on a large scale in QR's own workshops and at other manufacturers, and the Commonwealth Railways also ordered 22 identical units as the NM class.

The locomotives initially had open cabs, large steam domes and a Robinson type superheater. The engines that were completed after 1938 had closed cabs, smaller domes, new tenders and larger slide valves. The last 40 examples used Timken roller bearings, which in connection with the brown color scheme led to the nickname “Brown Bombers”, after the boxer Joe Louis.

The C17 quickly gained a reputation as a versatile and powerful locomotive. It was used with all train types from passenger over suburban to freight trains. Thanks to the low axle load, they could also be used in front of mail trains where the axle load of the Pacific class B18¼ was too high. The production of a total of 227 units ran over a long period from 1920 to 1953. Just one year after the end of production, the older engines were taken out of service, and the last survived into the late 1960s.

Variantas builtnew boiler
General
Built1920-1953
ManufacturerNorth Ipswich, Armstrong Whitworth, Clyde Engineering, Walkers, Evans, Anderson, Phelan & Co
Axle config4-8-0 (Twelve-wheeler) 
Gauge3 ft 6 in (Cape gauge)
Dimensions and Weights
Length53 ft 5 1/2 in
Fixed wheelbase12 ft 6 in
Service weight103,040 lbs
Adhesive weight79,865 lbs
Total weight175,280 lbs
Axle load19,996 lbs
Water capacity3,663 us gal
Fuel capacity18,592 lbs (coal)
Power
Power sourcesteam
Estimated power800 hp (597 kW)830 hp (619 kW)
Optimal speed27 mph25 mph
Starting effort19,215 lbf21,017 lbf
Power Plant
Driver diameter45 in
Boiler pressure160 psi175 psi
Expansion typesimple
Cylinderstwo, 17 x 22 in
Boiler
Grate area18.5 sq ft
Firebox area116 sq ft
Tube heating area884 sq ft824 sq ft
Evaporative heating area1,000 sq ft940 sq ft
Superheater area177 sq ft
Total heating area1,177 sq ft1,117 sq ft
Calculated Values
steam locomotive
freight
passenger
C.F. Pemberton
last changed: 10/2022
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