4-6-0+0-6-4

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4-6-0+0-6-4
Diagram of two small leading wheels, six large driving wheels in two trios, each trio joined by coupling rods, and two small trailing wheels
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 articulated 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 Mallet type locomotives, but is referred to as 4-6-6-4. On a Mallet locomotive, only the front engine unit swivels while the rear unit is rigid in relation to the main frame.

Overview[edit]

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.[1]
  • The other was two locomotives built for the 3-foot gauge Ferrocarril Pacifico de Colombia by Armstrong Whitworth in 1924.[2]
4-6-0+0-6-4 Garratt production list – All manufacturers[1][2]
Gauge Railway Works no. Units Year Builder
3 ft Ferrocarril Pacifico de Colombia 565-566 2 1924 Armstrong Whitworth
1,000 mm Mogyana Railway, Brazil 5529-5530 2 1912 Beyer, Peacock
1,000 mm Mogyana Railway, Brazil 5787-5789 3 1914 Beyer, Peacock

References[edit]

  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