Pretty Polly was an LNER A3 Pacific mentioned by the Elderly Brake Van in the annual story, Galloping Sausage. She was named after a female racehorse; the brake van commenting that it was a silly name for an engine.
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 Pretty Polly was withdrawn in September 1963 and scrapped soon afterward.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.
Pretty Polly first wore the LNER "Apple Green" livery with black and white linings before WWII when she applied the plain LNER "Wartime Black" livery. After the war was over, Pretty Pretty retrieved her original "Apple Green" livery. When British Railways was formed in 1948, the engine received an experimental BR "Express Passenger Lined Blue" with black and white linings livery until she finally applied BR "Brunswick Green" with black and orange linings livery in 1952.
- Enterprising Engines - Tenders for Henry (indirectly mentioned)
- James and the Diesel Engines - Fire-Engine (indirectly mentioned)
- 1992 - Galloping Sausage (mentioned)