These were cars 35 - 38and were delivered in 1941 as 2 pairs intended to provide increased capacity on the Cardiff to Birmingham route where the original 44 seat buffet railcars were hopelessly overtaxed. in fact even before Nos 35/6 were launched, it proved necessaryto further increase their capacity by adding a standard coach coupled between the two single ended railcars. With the coach modified to allow the control systems of the railcars to be linked, a three car DMU was produced. Though it pointed the way to the future with its two powered cars,it was not the first three carDMU, the LMS having experimented with an articulated three-car set in 1918.
Cars No36 & 38 had seats for 44 passengers, a small luggage section and a buffet section. The inner end of the cars were fitted with standard GWR gangway connections. Cars no 35 & 37 had seating for 60, a similar luggage compartment and two lavatoriesat the inner end adjacent to the gangway connection. Nos 36/37 initially worked with 70ft inermediate coach No 4509 to give a total capacity of 184, but from time to time during their career they ran with other intermediate vehicles or as a two-car set. No 37 was damaged by fire in 1947 and its place was taken by No 22 for a while. eventually in1954 No 33 was rebuilt with a gangway at the van end to run with No 38. 35/36 were withdrawn in 1957 And all the other razor edged cars went between 1960-1962 (this info from a larger article on GWR railcars in Model Rail January 2006)
