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That has a lot to do with which parts of the system are 4-track.

As a user I don't care if a line is 2 track, 3 tracks, or quad tracks. What I care is reliability and convinence (and price too but my company is paying for it so blah).

If you live in the Bronx, there's a good chance you won't be going home at 1AM by trains, even if the crazies don't get to you first.

The point is that if you have a four-track system, you can shut down two tracks for maintenance and still maintain service.

I think this is the comment the entire thread needs.

Not sure if I'm helping but here's my attempted visualization[0]

0: https://gist.github.com/numpad0/6e77028ab3e073e4b02f17cf50d0...

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