On Mon, 04 Apr 2005 10:50:13 GMT, Jack Taylor wrote:

Because as trains have become faster and more frequent there are fewer and
fewer paths for moving low-speed stock around the country. Would you
appreciate your 125mph train being delayed whilst a 40mph transfer of London
Underground stock limped into a loop ahead of you?

No, which is why I would very much appreciate the reinstatement of some
of the "slow lines" that have disappeared from 1979 onwards, and the
addition of some new ones where practicable.
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http://gallery120232.fotopic.net/p9767288.html
(Gatwick Express, Mark 1: 4VEG unit 7910 at London Victoria in 1980)