Well - I know that wasn't addressed to me, but I think I would start off by working out where we want to be in 20 years, and would then look to motivate all sectors involved - at all levels to get us there with their ownership of the project from grass roots level up. The problem is getting the right people with the right authority in the room ... there are some ideas which should form part of a solution which results in shocked responses when you suggest them.
I would hope that in 20 years time many / most of the train crew for who Sunday is not part of the working week and choose not to work overtime on this day will have either been offered an incentive to change their contract or will have retired and been replaced with new drivers whose shifts include Sundays.
I would also hope that not being able to drive certain routes because you haven't signed that route will be a thing of the past thanks to a rail equivalent of GPS which would notify you in advance of where the signals are, when to start braking for the next station etc.