I would say 2007 is right for the "silver bullets". It was running when I returned to the county. Use the link below to see a video was taken in Oct 2009 long after the regular run ended. You'll see Maurice Dart and D1015 at Par.
https://www.youtube.com/watch?v=UtXzhxyTC7U
I see you got the info about the summer loco hauled - can't wait for that to start again. Cheers Craig Many thanks Craig