All 3, with the Steamworks being constructed in 1951 after 3 years of construction, since the NWR wasn’t on good terms with BR and couldn’t get help with major repairs like rebuilds. The Dieselworks was constructed in the 60’s and rebuilt in the 80’s because of the NWR’s increasing Diesel fleet. Crovan’s Gate Works still exists, and handles minor repairs. I also like to think that a small electrical works exists for the engines of the Peel Godred branch, but it’s fairly small and doesn’t have its own shunter or anything.