On Fri, 16 Nov 2007 17:05:14 +0000, Tom Anderson wrote:

This is one of the things that absolutely baffles me about the
automated signalling systems that are being deployed now - why is it
the signalling system that makes decisions about how fast a train
should go, and not the train?

I take it you are happy with the concept of double yellows?

Yes.

This is basically very similar.

...

Could you explain how?

Don't double yellows mean the train has to be going below a certain
(specified) speed on reaching the next signal?