Original: The class, numbering 230 examples, was built by British Railways' Swindon and Doncaster works in 1957-1962 and numbered D2000-D2199 and D2370-D2399 (later 03004 to 03399).
Simplified: There are 230 members of the class and it was built by British Railways' Swindon and Doncaster works in 1957-1962. They are numbered D2000-D2199 and D2370-D2399 (later 03004 to 03399).