"John Rowland" wrote in message
...
"Huge" wrote in message
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"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.


A good example of this is on the Victoria Line where trains under full ATO
approach termini at full operating speed. Does anyone know of any other
lines which have this feature?