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}}'''GWR 261''' is a '''Churchward 'Toplight' Gangwayed Passenger Brake''' (BG). This type of 'full brake', which was given the GWR telegraphic code "SNAKE C", contained no passenger seating and was therefore classed as [[:Category:Non Passenger Carrying Coaching Stock (NPCCS)| Non Passenger Carrying Coaching Stock]] (NPCCS). The internal layout consisted of a guard's compartment situated between two luggage compartments, the larger of which occupied more than half the length of the coach. A corridor along one side allowed passengers to pass through.The type was given the GWR telegraphic code "'''SNAKE C'''".<ref group="note">The telegraphic code SNAKE specified a Full Brake, of which there were four sub-types, SNAKE A (6-wheeled), SNAKE B (8-wheeled), SNAKE C (8-wheeled with side corridor) and SNAKE D (8-wheeled with gangways.</ref>

GWR 261 was designed by the GWR's Locomotive, Carriage and Wagon Superintendent George Jackson Churchward and built to Diagram K22. The first two carriages to that Diagram were built completed in 1915, with a after which further construction was halted by the First World War. A further 36 were built in 1921 and 1922,.<ref name=Longworth>[[Bibliography#Other References|Longworth (2018)]] p.134.</ref> the The last ones being were completed after Churchward 's retirement.<ref group="note">The title of 'Locomotive, Carriage and Wagon Superintendent' ended with Churchward's retirement, his successor C.B. Collett adopting the more familiar title 'Chief Mechanical Engineer' (CME).</ref> and were constructed with steel-sided flush panelling rather than the timber panelling and beading found on the earlier Toplight stock. The Diagram 22 carriages held the distinction of being both the last 'Toplights' to be built at Swindon and the last such carriages in BR use, continuing in service until 1961-62.<ref name=GW2022>GW(SVR)A Newsletter, Summer 2022, "''Churchward Passenger Brake Van Centenarians''", Chris Haynes</ref>