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London Midland and Scottish Railway Princess Coronation Class No. 6256 (British Railways number 46256) Sir William A. Stanier F.R.S. was a British steam locomotive.
6256 was built in 1947 at Crewe Works. 6256 was named after the former LMS Chief Mechanical Engineer, Sir William Stanier, who had introduced the "Duchess" class ten years earlier. It was the penultimate "Duchess" and the last LMS-built pacific. 6256, along with the last Stanier pacific, 46257 City of Salford (which appeared after nationalisation in 1948) was built with several modifications to the original Stanier design, by George Ivatt.
6256 was initially painted in LMS 1946 black livery.
After nationalisation in 1948, British Railways renumbered the locomotive as 46256. It was later repainted in BR Brunswick green, followed by BR maroon. 46256 was withdrawn in 1964, becoming the last Stanier pacific to be retired. It was scrapped by John Cashmore Ltd at Great Bridge.