Original: The British Rail Class 11 was applied to a batch of diesel shunting locomotives built from April 1945 to December 1952, based on a similar earlier batch built by the London, Midland and Scottish Railway (LMS) between 1939 and 1942.
Simplified: The British Rail Class 11 is diesel shunting locomotive built from April 1945 to December 1952. They are based on a similar earlier batch built by the London, Midland and Scottish Railway (LMS) between 1939 and 1942.