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diagram of the wheel arrangement
Type and origin
Power type Steam
Builder Beyer, Peacock and Company and
Build date 1912 and 1914 (Beyer, Peackock & Co.)
1924 (Armstrong-Whitworth)
Number rebuilt 5 (Beyer, Peacock & Co.)
2 (Armstrong-Whitworth)

In the Whyte notation for the classification of steam locomotives by wheel arrangement, the 4-6-0+0-6-4 is a Garratt articulated locomotive. The wheel arrangement is effectively two 4-6-0 locomotives operating back to back, with the boiler and cab suspended between the two power units. Each power unit has two pairs of leading wheels in a leading bogie, followed by three coupled pairs of driving wheels, with no trailing wheels. A similar wheel arrangement exists for Mallet type locomotives, but is referred to as 4-6-6-4.

Other equivalent classifications are:


This was a rare wheel arrangement for Garratt locomotives, with only seven locomotives built for two 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.[1] The other was two locomotives built for the 3-foot gauge Ferrocarril Pacifico de Colombia by Armstrong-Whitworth in 1924.[2]


  1. ^ a b Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives produced by Beyer, Peacock, retrieved 10 November 2012 
  2. ^ a b Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives from Other Builders, retrieved 10 November 2012