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Concept
Prairie (locomotive)
Résumé
Under the Whyte notation for the classification of steam locomotives, 2-6-2 represents the wheel arrangement of two leading wheels, six coupled driving wheels and two trailing wheels. This arrangement is commonly called a Prairie.
The majority of American 2-6-2s were tender locomotives, but in Europe tank locomotives, described as 2-6-2T, were more common. The first 2-6-2 tender locomotives for a North American customer were built by Brooks Locomotive Works in 1900 for the Chicago, Burlington and Quincy Railroad, for use on the Midwestern prairies. The type was thus nicknamed the Prairie in North American practice. This name was often also used for British locomotives with this wheel arrangement.
As with the 2-10-2, the major problem with the 2-6-2 is that these engines have a symmetrical wheel layout, with the centre of gravity almost over the centre driving wheel. The reciprocation rods, when working near the centre of gravity, induce severe side-to-side nosing which results in intense instability if unrestrained either by a long wheelbase or by the leading and trailing trucks. Though some engines, like the Chicago and Great Western of 1903, had the connecting rod aligned onto the third driver, most examples were powered via the second driver and were prone to the nosing problem.
Queensland Railways operated one 2-6-2 tender engine of the B16 1/2 class. It was built in August 1918 by the North Ipswich Railway Workshops as an experimental engine burning coke instead of coal. After nearly 9 years burning coke, it was converted to coal in 1927. The engine spent its working life on the Brisbane to Ipswich line working coal trains. It was withdrawn in February 1950.
In New South Wales a class of twenty engines, the Z26 class, formerly the (I)17 class, entered service in 1892 and operated until the end of steam. Two are preserved, no. 2606 at the Rail Transport Museum at Thirlmere and no. 2605 at the State Mine Museum in Lithgow.
The Silverton Tramway operated two 2-6-2T locomotives from 1891, both of which are preserved in South Australia.
Source officielle
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