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Why are there so many tunnels under London?

economist.com

21–30 of 73 posts

Re: Why are there so many tunnels under London?

#22
post #3
post #2

The city is too old.

I don't know about 'too old', but it is old. It states in the article that..." the London Underground, opened in the city 150 years ago.: The county I am living in currently, will be celebrating only its 42 birthday tomorrow...think about it.

To add a little perspective I live in rural England in a small thatched house that appears on a map dated 1420.

That's 30 years before Christopher Columbus was born — and Richard III; 100 years before Queen Elizabeth I was born.

It was built before chimneys were invented: one was fitted at some point, probably at the same time the upstairs floor was put in (you can't have an upstairs without a chimney). The refurbishment date is scratched into the plaster work: Feb 1722.

Re: Why are there so many tunnels under London?

#23
post #4
post #2

The city is too old.

Just new enough that you can usually safely dig without too many delays, though. A problem with tunnel construction in very old cities, in places like Italy and Greece, is that you have a high probability of running into an interesting archaeological site, and then you have to pause construction and decide what to do about it. E.g.: http://www.bbc.co.uk/news/world-europe-21743758

That happened quite recently in London for the new CrossRail track: http://www.bbc.co.uk/news/uk-england-london-23609994. Not that I agree that the city is too old, or that this is a major problem; from the sounds of it, the CrossRail planners were well aware they'd run into interesting archeological finds, so allotted resources to deal with it.

Re: Why are there so many tunnels under London?

#24
post #4
post #2

The city is too old.

Just new enough that you can usually safely dig without too many delays, though. A problem with tunnel construction in very old cities, in places like Italy and Greece, is that you have a high probability of running into an interesting archaeological site, and then you have to pause construction and decide what to do about it. E.g.: http://www.bbc.co.uk/news/world-europe-21743758

Infrastructure work in Jerusalem supposedly often runs into such problems too.

Re: Why are there so many tunnels under London?

#25
post #3

Earlier quoted context omitted.

I don't know about 'too old', but it is old. It states in the article that..." the London Underground, opened in the city 150 years ago.: The county I am living in currently, will be celebrating only its 42 birthday tomorrow...think about it.

And I am very thankful that the undergrounds in the cities where I spent most of my time were built much later: Tunnelling techniques evolved quickly during the late 18th and early 19th century, allowing for much more ‘comfortable’ tunnel diameters – there is a reason the London Underground is called the tube, it’s difficult to stand in most of its trains.

This is complete nonsense. It's perfectly easy to stand up in the underground train cars.

Re: Why are there so many tunnels under London?

#26
post #20
post #18

There are lots of secret MOD tunnels as well. Some of them run out of London across the country with rail tracks to nuclear bunkers that were to be used when nuclear war broke out. To put the scale of it in perspective, one if the tunnels runs to a bunker in Wales south of Aberystwyth.

Do you have a source for that last example? Seems like it would be a bit difficult to keep a tunnel of that scale secret.

It's not really a a secret if he knows about it.

Re: Why are there so many tunnels under London?

#27
post #3

Earlier quoted context omitted.

I don't know about 'too old', but it is old. It states in the article that..." the London Underground, opened in the city 150 years ago.: The county I am living in currently, will be celebrating only its 42 birthday tomorrow...think about it.

And I am very thankful that the undergrounds in the cities where I spent most of my time were built much later: Tunnelling techniques evolved quickly during the late 18th and early 19th century, allowing for much more ‘comfortable’ tunnel diameters – there is a reason the London Underground is called the tube, it’s difficult to stand in most of its trains.

How tall are you? I'm 5'11", or 1.80 m, and I have no trouble at all standing in trains on the London underground.

Re: Why are there so many tunnels under London?

#28
post #3

Earlier quoted context omitted.

I don't know about 'too old', but it is old. It states in the article that..." the London Underground, opened in the city 150 years ago.: The county I am living in currently, will be celebrating only its 42 birthday tomorrow...think about it.

And I am very thankful that the undergrounds in the cities where I spent most of my time were built much later: Tunnelling techniques evolved quickly during the late 18th and early 19th century, allowing for much more ‘comfortable’ tunnel diameters – there is a reason the London Underground is called the tube, it’s difficult to stand in most of its trains.

Most of the early ones were "cut and cover" and quite big, rather than bored. And there is little difference in the sizes of the tunnelled ones.

Re: Why are there so many tunnels under London?

#29
post #18

There are lots of secret MOD tunnels as well. Some of them run out of London across the country with rail tracks to nuclear bunkers that were to be used when nuclear war broke out. To put the scale of it in perspective, one if the tunnels runs to a bunker in Wales south of Aberystwyth.

London to Aberystwyth is about 380km. I seriously doubt there's a tunnel.

Re: Why are there so many tunnels under London?

#30
post #2

The city is too old.

The difference between America and England is that the Americans think 100 years is a long time, whereas the English think 100 miles is a long way.

Just for reference ...

My house was built in 1903. The college I went to was founded in 1352. The city my wife grew up in was occupied by the Romans sometime between 70 and 80 AD.

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