That's as good as spot on. This was the train that caused the infamous Conington incident on one of the hottest days of 2005.
http://news.bbc.co.uk/1/hi/england/cambridgeshire/4125312.stm
The article isnt quite correct, - the cables came down between Huntingdon and Abbots Ripton, not Peterborough but the outcome was the same. I watched it all unfold live. What happened was:
A down freight service hauled by a class 60 had a catastrophic motor failure just south of Huntingdon station on the fast line. The loco was locked solid and could not be hauled or moved under it's own power. The 66 you see in the photo was sent to retrieve the freight train while the failed 60 itself was attended to. All down traffic was routed on to the slow line through Huntingdon. That included the 91 + Mk4 set you see here. It was directly ahead of the rescue 66. It passed through the station at about 40mph to be routed back on to the fast line just North of the station. As it started the crossover the pan got caught in the wires (the OLE overlap span is also at the crossover) and because it's headspan over 4 tracks, the whole lot failed on all lines. This affected the GNER train at Connington a few miles up the track - which got stuck in a remote location with total power failure and no easy way of getting a loco to it (apparently a 365 was also stuck heading north which blocked any attempts at getting a thunderbird to it from the south, but as we know, 365's at least have windows that open).
Anyway, the 66 that was sent to help the 60 ended up being a thunderbird to the 91 set and pulled it back into Huntingdon station once they'd de-tangled the pantograph and subsequently removed it (see attached photo of 91 with pan removed some 2 hours later). I was fed the whole story in real time from a NR staff member who was happy to keep me informed (I was wearing my railway credentials at the time) as it all unfolded. By the time the GNER set was removed from Huntingdon it was dark (about 6 hours later), the freight train was still there at 11pm that night but by the next morning it had gone. Huntingdon station was pretty much chaos as northbound trains (once started later that night) used the southbound platform. There were passengers trying to get to Newcastle still at the station at 10pm! Crazy evening, but it was interesting now looking back at it.