[iampuking]

The London Underground sub-surface trains (Metropolitan, Circle, Hammersmith and City and District lines) will get loads of brand new trains. Thank god is all I say, the bloody Circle line is absolutely awful... but it will be a shame to see those rickety old Metropolital Line trains going... ah well, what are your thoughts on this?

http://www.transportbriefing.co.uk/story.php?id=3597

[JonDoe]

Isn't an underground train sub-surface by definition?

[iampuking]

don't know. But the Metropolitcan, Circle, Hammersmith & City and District lines are all by "underground" definition.

[DeltaUnit22]

I am highly tempted to make an inappropriate comment about train spotting and needing to get out more, but I will refrain.

[iampuking]

Originally Posted by DeltaUnit22

I am highly tempted to make an inappropriate comment about train spotting and needing to get out more, but I will refrain.

I'm not a trainspotter. But no need to be snide, if they like spotting trains then they can do it all they want. Hey, it's better than fox hunting for a 'hobby'

[Glen]

Originally Posted by JonDoe

Isn't an underground train sub-surface by definition?

As opposed to deep-level tunnels.
Sub-surface (in TfL lingo) means the "cut-and-cover" lines (ie dig a trench up along a street, put a railway line in, put a roof on and replace street on top).
Deep-level lines are the "tube" tunnels (dug with a boring machine).

The difference this makes is the shape and size of the tunnel - and the trains required to fit in them.

[skp20040]

Originally Posted by JonDoe

Isn't an underground train sub-surface by definition?

They are, I call it all the undergorund but in the train making world there are two types of "underground" train
, the tube which is for the real deep undergound train and the subsurface train for the newer lines that are not far beneath the surface.

http://en.wikipedia.org/wiki/Image:L...ube_trains.jpg

[JonDoe]

Cheers folks.

I'm a bit cleverer than I was five minutes ago.

[imno12u]

Originally Posted by Glen

As opposed to deep-level tunnels.
Sub-surface (in TfL lingo) means the "cut-and-cover" lines (ie dig a trench up along a street, put a railway line in, put a roof on and replace street on top).
Deep-level lines are the "tube" tunnels (dug with a boring machine).

The difference this makes is the shape and size of the tunnel - and the trains required to fit in them.

Sounds riddled in tautology if you ask me.