==After nationalisation==
After nationalisation, BR adopted During the Second World War the LNER developed a somewhat more refined sophisticated version of the GWR's classification systemwhich was adopted by BR after nationalisation. Route Availability was based on classes RA 1 to RA 10and took into account the weight per foot length of a locomotive rather than just the simple axle loading used by the GWR, while locomotive power was based on classes 0 to 9 with distinctions made for Passenger, Freight and Mixed Traffic. <ref>[https://www.devboats.co.uk/gwdrawings/weightrestrictions.php devboats.co.uk]</ref><ref>Wikipedia</ref> However in BR's Western Region, the old GWR system continued to be used on ex-in use until after the Severn Valley Branch closed in 1963, with BR locomotive classes being allocated the relevant GWR locomotives on route colours. For example a BR Standard Class 4 tank engine such as [[80079]] was given the general BR classification of axle load class RA5 and power class 4MT. Within BR Western Region(W) the route availability became "''Class 4 (2-6-2T) (80XXX): Prohibited on 'Yellow' and 'Uncoloured' routes. Restrictions – as for 'Blue' engines.''"<ref>Wikipedia[http://www.michaelclemensrailways.co.uk/?atk=559 ''British Railways Western Region, Locomotive Route Availability, June 1963'' via Michael Clemens]</ref>.
==Preservation==