On Jun 25, 1:12 am, "John Rowland"
wrote:
Christopher A.Lee wrote:
On Sun, 24 Jun 2007 14:32:52 GMT, wrote:

My normal experience of Tube trains going through temporarily closed
stations is that they may slow to 5-10 miles, but they don't stop. I
guess that they are similar to draw up signals in that they will
clear if approached at a certain speed, assuming that there is no
train ahead of the one in the station.

I suspect the approach control signals are still there so they have to
slow for them.

It's actually to do with the lengths of the signal overlaps on the exit from
the station. A train departing a closed station at full speed can crash into
another train without being stopped by the signalling. A train departing the
station having stopped, or crawled, can't.



I guess that a lot of reasons coincide, and that slowing to a crawl
solves all of them. There must also be a risk of things falling on
the line if work is going on, and at a slow speed there would be a
better chance of stopping before a collision (or maybe swerving around
them, if LU trains have the same facilities as Pendolinos).