If they want the trains to run let them pay to subsidise the service then!
there is no way running any sort of full Boxing day service will cover its costs!
NR use the 2 days to do some major renewal works so when do you propose to do these then?
There might be enough demand for some shorter journeys into the main Cities as shopper specials but long distance stuff would be a waste of time.
then there is the small matter that most Drivers and Guards have it in their contracts that they will not be required to work on Christmas and Boxing days, how are you going to get around that then? Change our contracts? Good luck with that one!
Me, until I am compelled to work either of them I will be at home trying to work out how this years must have toy is supposed to go together while partaking of a shandy or 3!