From the 1920s onwards the GWR used the term 'B set' to designated a formation of two coaches used principally for branch and local passenger services. A number of 'B sets' were purpose built, comprising two identical brake composite coaches. These coaches contain compartments for first and third class passengers, plus space for the guard, passenger luggage, mail and parcels and were coupled with guards' vans at the outer ends of the train.
This 2 coach pack from Dapol models replicates one of these short trains, which would often be hauled by one of the small GWR tank engines, including the 14xx class 0-4-2s, 57xx class panniers and 45xx class 2-6-2 prairies.