One hundred of these locomotives were built from 1965 to 1966 by either English Electric at Vulcan Foundry , Newton-le-Willows , or British Rail ( BR ) at their Doncaster works .
One hundred of these locomotives were built from 1965-1966 by either English Electric at Vulcan Foundry , Newton-le-Willows , or British Rail ( BR ) at their Doncaster works .