The Missouri-Kansas-Texas #311 (MKT 311) is a classic steam engine and a key piece of American transportation history. Built by the Baldwin Locomotive Works in 1890, the engine operated in passenger service for the MKT, or Katy Railroad, for more than 60 years until 1950. Following a decision to end all MKT steam operations in 1953, the #311 became the last remaining of more than 1,000 Katy steam locomotives. All other sister locomotives were scrapped to make way for new technology. Today, it is the only known example of its kind.

The #311 has been on display at The National Museum of Transportation since 1952. Over its long and storied career, the engine was renumbered, rebuilt, and updated several times. Volunteers from the Katy Railroad Historical Society (KRHS) championed the restoration of this engine. In 2019, volunteers received permission from the Museum to begin the careful and detailed cosmetic restoration of this engine. They performed significant research to determine the correct appearance, materials, and techniques to complete this work. Dedicated and talented volunteers completed nearly all work for this project, keeping conservation costs low. Thank you volunteers!