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I’m a complete ignoramus on the subject and so am posting it here for others to take forward, if relevant. I saw on [https://www.national-preservation.com/threads/steam-era-route-availability-categories.1420000/#post-2687309 Nat Pres] a thread which touches on the origins of [[GWR Power and Weight Classification#After_nationalisation| 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, but there's a [https://www.devboats.co.uk/gwdrawings/weightrestrictions.php link].--[[User:Patrick Hearn|Patrick Hearn]] ([[User talk:Patrick Hearn|talk]]) 22:09, 2 September 2021 (UTC)