The NS Class 600 were a class of 65 shunting locomotives built by English Electric in England between 1950 and 1957 for Nederlandse Spoorwegen (NS). The first 10 were built at Dick, Kerr & Co, Preston and the remaining 55 at Vulcan Foundry, Newton-le-Willows. They are very similar to the British Rail Class 11. Twenty-three locomotives were later fitted with radio remote-control, and renumbered in the range 671–693.

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 1934 and 1936.