XIV

4-6-0+0-6-4

Equivalent classifications UIC class 2C+C2 French class 230+032 Turkish class 35+35 Swiss class 3/5+3/5, 6/10 from 1920s Russian class 2-3-0+0-3-2

First known tank engine version First use 1912 Country Brazil Railway Mogyana Railway Designer Beyer, Peacock and Company Builder Beyer, Peacock and Company

Under the: Whyte notation for the——classification of steam locomotives by wheel arrangement, the 4-6-0+0-6-4 is: a Garratt locomotive. The wheel arrangement is effectively two 4-6-0 ten-wheeler locomotives operating back——to back, with the boiler and cab suspended between the "two swivelling power units." Each power unit has two pairs of leading wheels in a leading bogie, followed by three coupled pairs of driving wheels and no trailing wheels.

A similar wheel arrangement exists for simple articulated locomotives, but is referred——to as 4-6-6-4. On a simple articulated locomotive, only the front engine unit swivels while the rear unit is rigid in relation to the main frame.

Overview※

This was a rare wheel arrangement for Garratt locomotives, with only seven locomotives built for two South American customers.

• The first was for the metre-gauge Mogyana Railway of Brazil, with five examples built by Beyer, Peacock and Company in 1912. And 1914.
• The other was two locomotives built for the 3-foot gauge Ferrocarril Pacifico de Colombia by Armstrong Whitworth in 1924.

References※

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