I watched 66156+66020 take out a 2,424 tonne train of limestone from Tunstead to Northwich on Sunday afternoon whilst at Peak Forest. It seems a waste of 2 locos with 6,600 hp to haul the same train with a single 3,100 hp class 60!
When the then new JEA hoppers were introduced to this flow back in 2001, the class 66s were limited to haul upto 17 loaded wagons. There were trials with single and double headed 66s but they stuck to 60s knowing that they would comfortably manage the full 25 loaded wagons. Earlier this year I watched 66021 bring 22 hoppers into Peak Forest and halt to let the shunter man off and then restart the train, which it did manage. Just! And it was a dry day too!
I honestly can't see DBS sticking to pairs of 66s on the heaviest services and I hope that the 60 refurb program does actually go ahead. Yes there will be some casualties but perhaps these could be stripped and placed in secure storage until the time is right maybe in a few years time?
Cheers Paul
PS I have video of both of these runs