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I think what you saw Tony has something to do with the blockade on the freight lines on part of the North London Line. Currently, the majority of freight (mainly Freightliners) are being dragged over the Gospel Oak to Barking line by 66s.
I don't know for sure, but I think a few of these liners have a 66 on the back so they can get them between London and Ipswich for fuelling purposes, etc. Tagging locos on the rear of freights also saves paths on the GEML.
Will try and find out a bit more.
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