The LNER Peppercorn Class A1 is a type of express passenger steam locomotive. Forty-nine original Peppercorn Class A1s were built to the design of Arthur Peppercorn (who was the last CME of the LNER) during the early British Railways era.

By summer of 1966, all 49 class members had gone for scrap. The last to be withdrawn from stock was No. 60145 Saint Mungo, after a working life of just 17 years. 60145 Saint Mungo was planned to be preserved by Geoff Drury; however, this ultimately was unsuccessful and none of the original locomotives were preserved

In 2008, a brand new 50th Peppercorn A1 locomotive, 60163 Tornado, was completed. Tornado is the first newly built British mainline steam locomotive following the completion of No. 92220 Evening Star in 1960, and the only Peppercorn Class A1 in existence after the original batch was scrapped. In 2017, Tornado became the first steam locomotive to officially reach 100 mph on British tracks for over 50 years.