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|cartype = [[:Category:Carriage Type SK|SK]]
|seats = 64 (as built)
|built = 19991955-56
|years1 = 1986
|events1 = Entered preservation
|years6 =
|events6 =
}}The BR Mark 1 Corridor Second (SK) was the most prolific of the Mark 1 passenger stock, with more than 2,200 built. However they were an early candidate for witdrawalwithdrawal, being replaced by Mark 2 Open, HST sets and Networker Turbo units.<ref name = StockBook>SVR Stock Book 9th edition</ref>
24839 was built at Derby in 1955<ref>Railway Heritage Register Carriage Survey</ref> or 1956<ref name = StockBook/> to diagram number 146 of lot number 30153.