4-6-0+0-6-4

4-6-0+0-6-4

diagram of the wheel arrangement

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

Specifications

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:

• UIC classification: 2C+C2 (also known as German and Italian classifications)
• French classification: 230+032
• Turkish classification: 35+35
• Swiss classification: 3/5+3/5 up to the early 1920s, later 6/10

Overview

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]

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

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