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Corrected 80XXX from 2-6-2T to 2-6-4T
During the Second World War the LNER developed a somewhat more sophisticated version of the GWR's classification system which was adopted by BR after nationalisation. Route Availability was based on classes RA 1 to RA 10 and 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 in use until after the Severn Valley Branch closed in 1963, with BR locomotive classes being allocated the relevant GWR 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(W) the route availability became "''Class 4 (2-6-2T4T) (80XXX): Prohibited on 'Yellow' and 'Uncoloured' routes. Restrictions – as for 'Blue' engines.''"<ref>[http://www.michaelclemensrailways.co.uk/?atk=559 ''British Railways Western Region, Locomotive Route Availability, June 1963'' via Michael Clemens]</ref>.
==Preservation==
