No.75 of British Steel Lackenby works (Sentinel 10075, built 1961) is out of use and awaiting scrap in 1974.  These locos took their running numbers from the last 
two digits of the maker's works number.

Photo and scan by Les Richardson (les@cirsel.freeserve.co.uk)

http://www.cirsel.freeserve.co.uk/trains.htm