Here are some more thoughts:
You and I may not agree with all these, but I bet that some people in DfT are looking at such possibilities.
- Close the network down two hours earlier at night and rearrange the maintenance programmes to use the longer windows for track access.
- Use the technology of Autonomous Cars to supplement the driver. At first introduce it as a safety feature, like TPWS, to override the driver and limit the speed of the train or bring it to a stop if necessary. AV would not have used a fallen tree in the dark as the braking point before the Salisbury train crash. When the technology has proved itself, use AV to provide the route knowledge needed, rather than having to maintain route competencies in the workforce.
- Abolish TUPE
Whilst a day in day out shortening of service operation hours would cause issues, I could see that a timetabled running off this could work.
For example, doing so on the first Monday of the month for one line but the second Monday of the month for another.
In doing so it gives you some longer overnight maintenance slots, but they are limited, so people can work around them.