The Caledonian Railway 670 Class was a class of 0-4-2 steam locomotives designed by George Brittain for the Caledonian Railway (CR) and introduced in 1878.

[1] Nine locomotives were withdrawn in 1922, or earlier.

Twenty-one survived into the ownership of the London, Midland and Scottish Railway (LMS) in 1923; these were withdrawn between 1923 and 1932.

[2] This article relating to steam locomotives operated in Scotland is a stub.

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