In article , Roland Perry
writes
[These are excusable when the tubes were originally designed for normal
working hours. I think we forget how little of life was 24x7 as
recently as 30 years ago. I could certainly drive from Cambridge to
Chelmsford at midnight and see no other car on the road. At some point
this changed radically - perhaps the tubes need to keep up.]

The answer, of course, is cost. Digging new crossover tunnels isn't
cheap. Signalling changes are cheaper, but is it a better way to spend
the money than running night buses instead?

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Clive D.W. Feather | Home:
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