:The British Railways system of classifying steam locomotives by power using a number from 0, least powerful, to 9, most powerful, followed by either F for freight, P for Passenger or MT for Mixed Traffic.
;0F
;1F
;7MT
;8MT
;9MT:The British Railways system of classifying steam locomotives by power using a number from 0, least powerful, to 9, most powerful, followed by either F for freight, P for Passenger or MT for Mixed Traffic.
;56xx:A GWR 0-6-2T engine
;57xx:A GWR 0-6-0PT engine