2-6-0+0-6-2

2-6-0+0-6-2 (Double Mogul)

WAGR M class no. M388, the first Double Mogul Garratt locomotive

Equivalent classifications UIC class 1C+C1 French class 130+031 Turkish class 34+34 Swiss class 3/4+3/4, 6/8 from 1920s Russian class 1-3-0+0-3-1

First known tank engine version First use 1911 Country Australia Locomotive WAGR M class Railway Western Australian Government Railways Designer Beyer, Peacock and Company Builder Beyer, Peacock and Company Evolved from 0-4-0+0-4-0

Under the Whyte notation for the classification of steam locomotives, 2-6-0+0-6-2 represents the wheel arrangement of an articulated locomotive with two separate swivelling engine units, arranged back to back with the boiler and cab suspended between them. Each engine unit has two leading wheels in a leading truck, six powered and coupled driving wheels on three axles and no trailing wheels.

The arrangement is effectively two 2-6-0 locomotives operating back-to-back and was used on Garratt articulated locomotives. Since the 2-6-0 type was often known as a Mogul, the corresponding Garratt type was usually known as a Double Mogul.

A similar wheel arrangement exists for Mallet steam locomotives on which only the front engine unit swivels, but these are referred to as 2-6-6-2.

The 2-6-0+0-6-2 was the second Garratt type to appear after the original 0-4-0+0-4-0 and was first used on the fourth through ninth Garratts to be constructed.

A group of six locomotives of 3 ft 6 in (1,067 mm) gauge were constructed for the Western Australian Government Railways in 1911 as their Class M. Further locomotives for this railway included seven more Class Ms locomotives in 1912.

The Australian Portland Cement Company took delivery of two 3 ft 6 in (1,067 mm) gauge locomotives in 1936 and 1939, as their no. 1 and no. 2 engines for the quarry line at Fyansford, Victoria. These engines replaced two Vulcan Iron Works 0-6-0 saddle-tanks on the mainline haul until they were later displaced by Australian Standard Garratt no. G33.