Having seen a feasibility study for a totally different area of rail operations I suspect many of the things said to be feasible would only be achievable after a lot of costly adjustments out of all proportion to any benefits to be gained. Feasible if...... and when ............. can be guaranteed first. The one I saw was apparently feasible. That meant the consultant's time, effort and bill could be said to have been justified. Nevertheless, it went straight onto an electronic shelf to gather dust where it will remain until it gets forgotten about or until it's accidentally deleted. I'd have said the costs were understated and the assumptions of outcomes were far too optimistic.
There's talk of managers not wishing to work Saturday trains. There are a lot of staff who are not called managers helping to keep the trains running. Many are not used to working Saturdays and they aren't died in the wool railway people from the north. If they're normal workers they'll be looking at jobs elsewhere and, especially if they're good, will go and get them. Why hang around with all this hassle?
When they do try keeping the wheels turning the day job has to suffer. That can have all sorts of consequences when tasks get behind. Once or twice a month is different from every Saturday. Some dedicated staff will be taking more work home, or trying to do it on lap tops between trips. These factors will bring their toll as fatigue starts to set in. A lot of things that should have been done won't have been, or not done as well as they should. People expecting actions may find they're delayed, or just don't happen. Projects within Northern may suffer, and collateral disruption is unpredictable.
The damage caused by the dispute is greater than the missing trains. That's what happens during periods of industrial action, anywhere.