Still with DEL original worksplate at an estimated date. 33001 can be identified as the original D6500 machine had only 10 roof vents fitted to the side visible in this photo, the rest of class 33/0 and 33/1 had 12. D6500 carried snowploughs from about 1961 and kept them until she was scrapped. Thanks to Dave Patch for this info.Estimated date.