If one project underruns and saves money, does the treasury off set that against one that might overrun?
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But if it was busier around this time the train companies would know that via their passenger usage figures. I often read on here that it is quieter over Christmas.
May be it's different for long distance services but South West Trains run less trains between Christmas and the new year and they wouldn't be doing that if it was busy as usual.
The report says that East Coast had sold 36,714 advance tickets for Saturiday 27 December. I don't know how that compares to a typical weekday or Saturday, but it's clearly a lot of people.