The A10 Fairlie class steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 is a 2-4-0

2-4-0

Under the Whyte notation for the classification of steam locomotives, 2-4-0 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles, and no trailing wheels....

 locomotive of the Queensland Railways (QR).

The locomotives operated on 1,067 mm (3 ft 6 in) gauge. The “A”, is used to identify the number of coupled wheels, being four coupled wheels for the A10 class, followed by numerals indicating the cylinder diameter of ten inches.

They were described as "A10 Fairlies" (because they were ordered from the Fairlie Engine Company) but they were not Fairlie articulated locomotives.

Builders

Three locomotives were ordered from the Fairlie Engine Company which sub-contracted the order to the Vulcan Foundry

Vulcan Foundry

Vulcan Foundry was a British locomotive builder sited at Newton-le-Willows, Lancashire .-History:It was originally opened in 1832 as Charles Tayleur and Company to produce girders for bridges, switches and crossings, and other ironwork following the opening of the Liverpool and Manchester Railway...

and both companies gave them works numbers.

QR no.	Vulcan no.	Fairlie no.
202	802	602
203	803	604
204	804	603