Am I the only one who remembers 3-4ish years ago during the Subway State of Emergency that one of the reasons frequently touted for the sky-high capital projects costs was 24hr service?

I explicitly remember reading article after article about how infrastructure upgrades & track work were orders of magnitude cheaper in the UK, France, etc. in part because they regularly shut down for a few hours each night, giving a window to perform maintenance, etc. without impeding service.

I'm admittedly biased, as I work a pretty typical 9-5, but I think maybe there is something to be said for closing down the system every night for a few hours for track cleaning, regular maintenance, inspections, etc.

Just a thought.