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Commonwealth appears to be the more common term
Although not present on the SVR, the UIC classification system also describes articulated vehicles (where the inner bogie is shared between two vehicles). So, 2'2'2 is used to describe an articulated pair of unpowered vehicles in the [https://en.wikipedia.org/wiki/British_Rail_Class_745 Stadler Class 745]. Where articulated sets are joined within a unit a '''plus sign''' sign is used, thus Bo'2'2+2'2'2.
===British Commonwealth classification===The UK generally uses a modified version of this notation (sometimes referred to as "Commonwealth classification" or "British classification") where the prime sign (single axle) and brackets (multiple axles per bogie) are replaced by a '''hyphen''' denoting the separation between groups of axles in a manner more akin to Whyte notation. Thus B'B' internationally equates to becomes B-B in the UK, Bo'Bo' equates to becomes Bo-Bo, (A1A)(A1A) equates to becomes A1A-A1A and so on. The SVR Wiki follows the UK structureuses this classification system.
==Examples on the SVR==
Examples found in diesels currently or formerly resident on the SVR are as follows:
{| class="wikitable sortable"
!British classsification Commonwealth classification !! UIC classification !! Description !! Examples
|-
|B || B || 2 powered axles connected by driving rods, no bogies||[[Ruston and Hornsby 165hp Diesel Shunter 319290|319290]], [[D2960]], [[D2961]]
==Links==
*[https://en.wikipedia.org/wiki/UIC_classification_of_locomotive_axle_arrangements UIC classification of locomotive axle arrangements] (Wikipedia)
*[https://en.wikipedia.org/wiki/Category:Commonwealth_classification Category:Commonwealth classification] (Wikipedia)
