I think you're implying that London is unique in not being able to be shut down.
But it is unusual, a lot of other subway systems have dual rail setups so they can close down an entire set of tunnels for inspection while the service still operates.

This is is why the New York subways runs 24 hours a day.
( Bazongaloid, Thu 26 Jan 2012, 13:20, 2 replies, latest was 14 years ago)

If you get stuck between stations in NY
you can sometimes see 1970s graffiti. I get very excited by this, because I am a twat.
( Monty Boyce, My cheese game is strong, Thu 26 Jan 2012, 13:23, Reply)

I like this.

( Dr. Shambolic je suis charlie, Thu 26 Jan 2012, 13:24, Reply)

This sounds like something I could learn all about on The Internet.
If my life were crushingly tedious and pointless.
( Dr. Shambolic je suis charlie, Thu 26 Jan 2012, 13:34, Reply)

Nah, you'd never find that information on the internet.
You can only get it by talking to other people.
( Bazongaloid, Thu 26 Jan 2012, 13:35, Reply)

If only I knew some crushingly tedious and pointless people in Real Life.

( Dr. Shambolic je suis charlie, Thu 26 Jan 2012, 13:51, Reply)

If you don't know a crushingly tedious and pointless person, then it's you.

( Bazongaloid, Thu 26 Jan 2012, 13:57, Reply)