The first 10 were built at Dick, Kerr & Co, Preston and the remaining 55 at Vulcan Foundry, Newton-le-Willows.

Twenty-three locomotives were later fitted with radio remote-control, and renumbered in the range 671–693.

[2] Some are still in use by the private company Rotterdam Rail Feeding in the Netherlands.

Privately owned 663 was moved from the Dartmoor Railway to the NRM annex at Shildon on 17 October 2006 to take up pilot duties.

There is a well known and accurate H0 scale model offered in various liveries by Roco.