Talk:GWR Power and Weight Classification

I’m a complete ignoramus on the subject and so am posting it here for others to take forward, if relevant. I saw on Nat Pres a thread which touches on the origins of route availability after nationalisation, which states: “..in 1940, the Civil Engineer's Department of the LNER Southern Area (ex-GN/GC/GE lines) devised a system of Route Availability (RA) classes. This was in a situation where WW2 was requiring engines to be assessed for use on lines outside their traditional areas [..] The initiative was successful and was extended in 1947 to the whole of the LNER, with the RA number henceforth being shown on locos [..] BR decided in due course to adopt the LNER system, although I'm not sure that it became network-wide before the 1970s.” It's not referenced.--Patrick Hearn (talk) 22:09, 2 September 2021 (UTC)