Built in April 1925 as an LNER A1 Pacific, Pretty Polly was rebuilt into an A3 in May 1944. She was first numbered to 2560, renumbered to 61, and finally 60061 under British Railways. Pretty Polly was withdrawn in September 1963 and scrapped soon afterward. She was Gordon, Lemberg, and Flying Scotsman's sister and Green Arrow, Mallard, Spencer, Ryan and the Flying Thistle's cousin.