which is the longest underground tube line in length? From start to end! Doesn't metter different ends of line

Answer 1

The longest underground tube tunnel is from East Finchley to Mordern on the Northern line - just over seventeen miles in length.

Answer 2

It is the Central Line, which is 46 miles long. The journey from West Ruislip to Epping is also the longest continuous journey it is possible to make on the Underground (ie, without changing trains).
The Northern Line is not the longest, contrary to popular belief. This stems from the fact that the Northern Line has the Underground's longest continuous tunnel, from just south of East Finchley to just north of Morden, via Bank, which is about 17.25 miles long. The various branches of the line also contribute to its entire length of about 36 miles, but this isn't continuous.

Answer 3

I believe its the Victoria line all of which is underground.

The Central line is a long journey had to make it enough times but a large portion of this is overground not in a tube.
The Circle line is also a surface line and doesn't really exist it is either the District or the Metropolitan depending where you are on it.

Answer 4

District Line

Answer 5

It's the Northern Line, check out this link for lots of other train tunnel length info also:-
http://en.wikipedia.org/wiki/List_of_further_tunnels_by_length

Answer 6

The Central line might be,.. that goes from zone 6 in West London to zone 6 in East London,. but I may be wrong,. I was going to say the Central Line, but someone already beat me to it! :D

Answer 7

The Chunnel, from England to France is the second longest, beaten only by the Seikan tunnel in Japan.
The Channel tunnel is 31mi long, while the Seikan is 33.49mi.

Answer 8

The circle line it is endless.