"Huge" wrote in message
...
"Peter Smyth" writes:

"Huge" wrote in message
...

What's an overrun tunnel?

When the tunnel continues past the terminus
so that if a train fails to stop
for any reason it doesn't go straight into a wall.

Ah. Thank you.

More to the point, safety rules stipulate that a train must approach a dead
end at very slow speeds. If there is an overrun tunnel, the trains can enter
the terminal station at the same speed as any other station. This slightly
improves journey times to and from the last station: more importantly, it
also increases the service frequency that can be run with a given number of
trains and drivers. It also increases the maximum number of trains that can
be run into the terminal station, and so possibly increases the number of
trains that can be run on the entire line.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes