Garratt locomotive wheel arrangement
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, the is a Garratt locomotive. The wheel arrangement is effectively two 2-8-0 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 four coupled pairs of driving wheels and no trailing wheels.
A similar wheel arrangement exists for Mallet type locomotives, but is referred to as since only the front engine unit swivels.
Overview.
This Garratt wheel arrangement was somewhat common, especially for locomotives intended for freight service. The first locomotive was a single metre gauge locomotive built by Beyer, Peacock &amp; Company in 1924 for the Burma Railways as their class GA.I. The second, and perhaps the better known, was the single Class U1 of the London &amp; North Eastern Railway (LNER), built in 1925.
Use.
Burma.
Apart from their first single class GA.I locomotive of 1924, the Burma Railways acquired another locomotive from Beyer, Peacock &amp; Company in 1927, classifying it GA.II. In that same year, another four of class GA.III were placed in service, also from Beyer, Peacock. In 1929, Krupp of Essen in Germany delivered eight more, designated Class GA.IV.
India.
The Bengal Nagpur Railway in India used two of the class HSG, built by Beyer, Peacock &amp; Company in 1925.
Ten examples were purchased by the British War Department in 1943 and used on the Bengal Assam Railway in India as their Class MWGX.
Mauritius.
The Mauritius Railway owned three 2-8-0+0-8-2 Garratts, also built by Beyer, Peacock &amp; Company in 1927.
Turkey.
The Ottoman Railways in Turkey acquired a single 2-8-0+0-8-2 Garratt from Beyer, Peacock &amp; Company in 1927.
United Kingdom.
The London and North Eastern Railway (LNER) owned a single Class U1 Garratt, built by Beyer, Peacock &amp; Company in 1925. It was designed by Nigel Gresley for banking coal trains over the Worsborough Bank, a steeply graded line in South Yorkshire and part of the Woodhead line. The Class U1 was both the longest and the most powerful steam locomotive ever to run in the United Kingdom.
References.
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External links.
 Media related to at Wikimedia Commons