Do the different london underground lines operate on different levels?

Question

Do the different london underground lines operate on different levels?

Answer 1

Yes.

Some are classed as deep level lines... like the Northern Line.

Answer 2

The older lines (Circle, District, East London, Hammersmith & City and Metroploitian) are a few metres below street level. They were constructed by digging a trench, laying the tracks and roofing over. The more Modern lines (Central, Northern, Piccadilly, Bakerloo, Victoria, Jubilee and Waterloo & City) were built using a tunneling shield (an early TBM) to avoid the distruption of digging up streets to lay the trench. There was a layer of clay soil under the city which was perfect for this construction method, but it was a some way below the surface, hence these lines are deeper (though the depth varies from about 30ft to over 200ft!)

Answer 3

Yes, some are classed as sub surface lines, and were built using the cut and cover method. The others are deep level lines and were made using a cutting shield. these lines have lifts or escalators to connect the platforms with the ticket office and the trains are lower due to small tunnels.