British Railways decided that changes in the steel industry would require the use of more bogie vehicles. The wagons fitted with bolsters to support the load were mainly grouped according to length (and hence the nominal capacity).
The largest wagons were classed as Bogie Bolster D, being 52ft in length with a load capacity of 42tons. The first wagons built for BR were 150 vehicles built at Derby in 1949 to an LMS design, which BR described as Diagram 1/470. This featured five fixed bolsters and lashing down rings on the solebar. LMS diamond frame bogies were fitted.
The next 200 vehicles were to an LNER design, appearing in 1950, as Lot 2211 to Diagram 1/472 with the outer 2 bolsters moveable between 2 locations and lashing rings set into the floor of the wagon. They were fitted with LNER diamond frame bogies.
1951 saw the appearance of Lot 2237 and with it, the change to GWR style plate bogies set the appearance of the vast majority of Bolster D, with over another 1600 unfitted Dia. 472 vehicles constructed in 14 lots until 1958. It is these wagons which feature in our 60T Bogie Bolster pack for Train Simulator.
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