This idea was sparked when I received the image below from a friend (who has kindly granted permission to post on RP). The train seen departing East Greta Junction in fine ALCO style (driver showing off for the camera?) on the 16th January 2011 is AS252, Unit 49. Locomotives: 48143, PL3, 48120, 48137 plus the usual load of 38 NHTF hoppers. This turned out to be one of the last 48/PL class hauled trains to run on the SMR before both rakes received EL class units on lease from CFCLA.
If anyone has details of the last run please feel free to post.