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4850 was built in 1935 to lot number 288 and first entered service at Oxford in July 1935.<ref>[http://www.greatwestern.org.uk/042_1400det.htm Great Western Archive]</ref> It was re-numbered 1450 by the GWR in 1946 and re-allocated to Slough in April 1951. While based there it was photographed in 1955 at Bourne End working an autocoach service to Maidenhead.<ref>''Signalman’s Reflections'', Adrian Vaughan, 1990, p68</ref>. A return to Oxford in September 1959 was followed by further re-allocations reallocation to Exeter (July 1962)which included The Locomotive Club of Great Britain's 'The West Countryman Limited' railtour over the Hemyock line on 24 February 1963 and timetabled operation of services from Tiverton.<ref>[https://www.sixbellsjunction.co.uk/60s/630324lc.html Six Bells Junction]</ref><ref>[https://railway-photography.smugmug.com/GWRSteam-1/Collett-Locomotives/Collett-Tank-Engines/Collett-Tank-Engines/Collett-1400-class/1400-1409-Built-1932/i-BT52nW4/A Dimmer, M., '1450 L C G B The West Countryman Limited Rail Tour 24 February 1963 ', Railway Photography on Smugmug] (Retrieved 26 October 2020)</ref><ref>[https://railway-photography.smugmug.com/GWRSteam-1/Collett-Locomotives/Collett-Tank-Engines/Collett-Tank-Engines/Collett-1400-class/1400-1409-Built-1932/i-q7JWPjP/A Dimmer, M., '1450 Tiverton 5 October 1963', Railway Photography on Smugmug] (Retrieved 26 October 2020)</ref> Further re-allocations followed to Taunton (November 1963) and Yeovil Town (October 1964) before a final move to Exmouth Junction in February 1965. 1450 was finally withdrawn from service by BR in May 1965,<ref>[http://www.brdatabase.info/locoqry.php?action=locodata&type=S&id=102303&loco=1450 BR Database]</ref> after a working life totalling 823,012 miles.