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'''34027 Taw Valley''' is a SR West Country Class 4-6-2 'Pacific' designed by Oliver (O.V.S.) Bulleid, CME of the Southern Railway (SR). Lighter in weight than their sister locomotives, the Merchant Navy class, they could be used on a wide variety of routes including in the south-west of England and the Kent coast. They were a mixed-traffic design, being used for both passenger and freight trains, and were latterly rated 7P6F by British Railways.  A total of 110 were produced, with the first 70 built by the SR between May 1945 and November 1947, and the final 40 built by BR between 1948 and 1951. 66 (the "West Country Class") were named after places in the West Country served by SR trains or close to its lines, and 44 (the "Battle of Britain Class") were named after RAF squadrons, airfields, commanders and aircraft that had participated in the Battle of Britain.  Originally built with innovative features including air-smoothed casings and chain-driven valve gear, many of the locomotives including 34027 were rebuilt by British Railways in the late 1950s. Of the 20 preserved examples, 10 are rebuilt (7 WC and 3 BoB) and 10 are still in original 'unrebuilt' condition (4 WC and 6 BoB). Rebuilt BoB class [[34053|34053 Sir Keith Park]] was resident on the SVR between 2012 and 2017. The five examples which have [[Steam Locomotives visiting the SVR for galas|visited the SVR for galas]] are all 'unrebuilt'; WC Class 34007 Wadebridge, 34092 City of Wells and BoB class 34072 257 Squadron, 34070 Manston, and 34081 92 Squadron.