Other equivalent classifications are:
The equivalent UIC classification is 1'B3' (or (1'B)'3' for a Mason Bogie).
This unusual wheel arrangement does not appear to have been used on the mainline railways in the UK. It was, however, one of the configurations used on the Mason Bogie articulated locomotives, in the US during the 1880s. Two examples were constructed at the Mason Machine Works for the narrow gauge Boston, Revere Beach and Lynn Railroad in 1892.
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