Diagram 1/146 started to appear in about 1952 and with its BR style hand brake, Morton brakes and welded body can be considered to be the standard design of 21T coal hopper. This is further reinforced when you consider that some 17000 wagons were constructed.
However, carrying coal in any type of steel wagon has one big problem, corrosion. This was originally dealt with but cutting out corroded sections and welding in new metal. By the late 1960's this approach had been generally superseded by the process of replacing the whole body. From 1971 to 1978 a major re-bodying program took place with larger numbers of wagons from all diagrams receiving a new style of welded body with two ribs on each side.
Given their sheer number a many dia 1/146 wagons would have received the new body and this is what is featured in our renders above. Fitted and unfitted wagons from other diagrams were also re-bodied and some gained vacuum brakes at this time too.
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