I can't comment if any others have been treated, but one of Northern's Class 156 sets has been internally refurbished. The grey bulky seats have been replaced with less bulky seats with a smart purple trimming. There is much more leg room, but despite thinner seats being used, it seems as though seating capacity has been somewhat reduced.
If I'd thought on I would have got a photo and ID of the train set. Will try next time
NEB Admin Team
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RE: Northern Rail