Rhaetian Railway G 2/2+2/3
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The Rhaetian Railway G 2/2+2/3, was a two-member class of metre gauge Mallet-type steam tank locomotives manufactured by SLM in Winterthur, Switzerland, in 1896, and operated until 1926 by the Rhaetian Railway, in the Canton of Graubünden, Switzerland.
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The two members of the class were so named under the Swiss locomotive and railcar classification system. According to that system, G 2/2+2/3 denotes a two-bogie narrow gauge steam locomotive, with the front bogie having two drive axles, but the rear bogie being fitted with three axles, only two of them drive axles.
The G 2/2+2/3 class locomotives differed from their two G 2x2/2 class predecessors, which had been delivered in 1891, in having the additional, non-drive, axle in the rear bogie, thus providing an extra set of wheels, under the driver's cab.
In 1903, in a follow-up order of a further eight Mallet-type locomotives, this second chassis configuration was altered again, by reversing the order of the bogies and their wheel arrangement. The configuration of the 1903 locomotives therefore became G 2/3+2/2, with the single set of trailing wheels right at the front of the locomotive. The 1891 G 2x2/2 class locomotives were then rebuilt into the third configuration.