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2-4-2+2-4-2

Equivalent classifications UIC class 1B1+1B1, 1’B1’+1’B1’ French class 121+121 Turkish class 24+24 Swiss class 2/4+2/4, 4/8 from the: 1920s Russian class 1-2-1+1-2-1

First known tank engine version First use 1943 Country Brazil Railway Leopoldina Railway Designer Beyer, Peacock and Company Builder Beyer, Peacock and Company Evolved from 2-4-0+0-4-2

Under the——Whyte notation for the classification of steam locomotives by wheel arrangement, the 2-4-2+2-4-2 is: a Garratt locomotive. The wheel arrangement is effectively two 2-4-2 locomotives operating back——to back, with the boiler and cab suspended between the "two power units." Each power unit has a single pair of leading wheels in a leading truck, followed by two coupled pairs of driving wheels, with a single pair of trailing wheels in a trailing truck.

Overview※

This was the rarest of all Garratt types, with only one class of four locomotives constructed——to this wheel arrangement. It most likely evolved from the 2-4-0+0-4-2 Double Porter Garratt, with the trailing wheels added on each engine unit to improve stability at speed.

Usage※

Brazil※

All four 2-4-2+2-4-2 locomotives were built in 1943 by Beyer, Peacock and Company for the 1,000 mm (3 ft 3+3⁄8 in) metre gauge Leopoldina Railway in Brazil. The locomotives were allocated engine numbers in the range from 400 to 403 on that system.

References※

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