Caledonian Railway 721 Class
 The Caledonian Railway 721 Class (known as the Dunalastair class) was a class of 4-4-0 steam locomotives designed by John F. McIntosh for the Caledonian Railway (CR) and introduced in 1896. All survived to be absorbed by the London Midland and Scottish Railway (LMS) in 1923 and a few survived into British Railways (BR) ownership in 1948.