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It's the south end of Kings Cross and they're coupled to the DVT, so the carriage rake's the right way round at least. That's a very rare capture: I've very occasionally seen a pair of 91s leading at the north end, presumably to avoid a light engine movement or due to failure of the train loco before departure from Kings Cross, but I've never seen a shot of a pair of 91s working blunt end first before! Perhaps a combination of a TDM or AWS fault on the DVT, plus a requirement to return a loco from Leeds to Bounds Green for whatever reason?