Queensland A12 class locomotive

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Queensland Railways A12 class
Type and origin
Power typeSteam
Builder Baldwin Locomotive Works (18)
Evans, Anderson, Phelan & Co (25)
Build date1882-1891
Total produced43
Specifications
Configuration:
​
 •  Whyte 4-4-0
Gauge 1,067 mm (3 ft 6 in)
Fuel typeCoal
Cylinders 2 outside
Cylinder size 12 in × 18 in (305 mm × 457 mm)
Career
Operators Queensland Railways
Dispositionall scrapped

The Queensland Railways A12 class locomotive was a class of 4-4-0 steam locomotives operated by the Queensland Railways.

4-4-0 locomotive wheel arrangement

4-4-0 is a locomotive type with a classification that uses the Whyte notation for the classification of steam locomotives by wheel arrangement and represents the arrangement: four leading wheels on two axles, four powered and coupled driving wheels on two axles, and a lack of trailing wheels. Due to the large number of the type that were produced and used in the United States, the 4-4-0 is most commonly known as the American type, but the type subsequently also became popular in the United Kingdom, where large numbers were produced.

Steam locomotive Railway locomotive that produces its pulling power through a steam engine

A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine. These locomotives are fueled by burning combustible material – usually coal, wood, or oil – to produce steam in a boiler. The steam moves reciprocating pistons which are mechanically connected to the locomotive's main wheels (drivers). Both fuel and water supplies are carried with the locomotive, either on the locomotive itself or in wagons (tenders) pulled behind.

Queensland Rail railway operator in Queensland, Australia

Queensland Rail, also known as QR, is a railway operator in Queensland, Australia. Owned by the Queensland Government, it operates suburban and long-distance passenger services, as well as owning and maintaining approximately 6,600 kilometres of track.

History

Between 1882 and 1895, the Queensland Railways took delivery of 43 4-4-0 locomotives built by Baldwin Locomotive Works (18) and Evans, Anderson, Phelan & Co (25). Per Queensland Railway's classification system they were designated the A12 class, A representing they had two driving axles, and the 12 the cylinder diameter in inches. [1]

Baldwin Locomotive Works former locomotive manufacturer from the United States of America

The Baldwin Locomotive Works (BLW) was an American manufacturer of railroad locomotives from 1825 to 1956. Originally located in Philadelphia, it moved to nearby Eddystone, Pennsylvania, in the early 20th century. The company was for decades the world's largest producer of steam locomotives, but struggled to compete as demand switched to diesel locomotives. Baldwin produced the last of its 70,000-plus locomotives in 1956 and went out of business in 1972.

Evans, Anderson, Phelan & Co was an Australian engineering and railway rolling stock manufacturer, located at Kangaroo Point, Queensland. It manufactured steam locomotives for the Queensland Railways until 1927. The works were not located near a railway, so completed locomotives were delivered along Main Street on temporary track.

Driving wheel powered wheel of a railway locomotive

On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons. On a conventional, non-articulated locomotive, the driving wheels are all coupled together with side rods ; normally one pair is directly driven by the main rod which is connected to the end of the piston rod; power is transmitted to the others through the side rods.

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References

  1. ↑ Armstrong, John (1985). Locomotives in the Tropics Volume 1. Brisbane: Australian Railway Historical Society. pp. 37–39, 97, 98. ISBN   0 909937 13 3.
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