A similar wheel arrangement exists for Mallet locomotives, but is referred to as 2-4-4-2 since only the front engine unit can pivot.

Only five locomotives were constructed to this arrangement, four of which were built by Beyer, Peacock and Company (BP).

[1][2] The four BP locomotives comprised three for the 5 ft 3 in (1,600 mm) São Paulo Railway of Brazil in 1915, and one for the 2 ft 6 in (762 mm) gauge Ceylon Government Railway (CGR) in 1929, the CGR's class H1.

[1] One more was built in 1919 by the São Paulo Railway, for its own use on 1,000 mm (3 ft 3+3⁄8 in) metre gauge.

[2] The single class H1 Garratt entered service on the Ceylon Government Railways in 1931.