I have never understood why Tube work could not be done in the evening when most people have left work. Perhaps if Transport for London closed the tube earlier for a certain period of time – say at 10pm in the evening, for example, rather than midnight – workmen could go underground during that time. It would give them seven or so hours to work.
I guess from the perspective of someone working in the City it would be much better if the Underground was closed at the weekend when people are not at work. But at the same time I think that if a Tube line was shut for one month it would not be that big a deal. There would be enough alternatives to choose from, from a public transport perspective.
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It would be easier to do the work over a month, particularly in the summer when people take time off. It would also be easier because it would mean you can sort out your travel arrangements in advance. This would be better than the work being done on an ad hoc basis and people never being quite sure when the Tube line would not be running.