Can any one tell me how many decks are there in Lodon Underground?

Question

answer is highly appreciated with a good reference

how many levels of underground lines are present

My question is at any level of london undergound how many deep surfaces are present
for example at regoin of russells square there are 4 deep lanes one underneath another

please some one answer my question
I know it is difficult but i think people working in lodon underground engineers may be able to help me out.
it is just curiosity and state of engineering making ask this question

Answer 1

London's underground lines are of two types. The first lines, the Metroplitan and the District (and the Circle which is a service using these lines) were build near the surface using "cut and cover" engineering. These lines are effectively all at the one level because of the way they were constructed.

The other lines - Northern, Piccadilly, Bakerloo, Central, Waterloo and City, Victoria, Jubilee - were bored through London clay and are deeper. Their depth varies: for instance they are further underground in the Hampstead region because the line is bored under hills. Whilst there are stations - Leicester Square is a clear example - where one line is bored deeper than another there is no concept of "decks" in that tube lines are consistently bored at selected depths.

There is a mass, not always well mapped, of tunnels under London - apart from the Underground there are tunnels for sewage, telephones and other purposes. It is actually quite a major problem to survey and fit in a new tunnel when required.

There is quite a large literature on the history and engineering of the London Underground. However, I am writing this response from general knowledge as an Englishman and Underground user.

Answer 2

Depends what you mean.

The train carriages themselves only have one deck.

The lines and stations are generally classified into two types: Deep-level and Sub-surface.

Deep-level lines are about 20 metres below the surface at their deepest, they are created by boring. Sub-surface lines are about 5 metres below the surface at their deepest, they are created by a cut-and-cover method. Both types reach the surface on the outskirts of London.

Answer 3

Lodon hasn't got a underground

Answer 4

Not sure what you mean by 'decks' can you rephrase question?

The Underground is on lots of different levels with some stations deeper than others.

Try looking at http://www.tfl.gov.uk/tfl/

Answer 5

deck? what do you mean by deck?

http://www.answers.com/topic/london-underground
http://www.tfl.gov.uk/tube/company/history/deep-lines.asp
http://www.faqs.org/faqs/uk/transport-london/section-7.html

your question is a bit vague,strange but I hope this helped