^Clinnick, Richard (April 2023). "Modernising the Moorgate branch". Rail Express. No. 323. Horncastle: Mortons Media Group. p. 87. ISSN1362-234X. Two DB Cargo locomotives, Nos. 66039 and 67002, are the 'first in class' for those fleets...
^Waller, Mike (December 2010). Skips for Hire. p. 14.
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