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The "obvious" way forward is to use GPS to locate every train in Britain to 1 metre accuracy in a giant computer, and do away with all trackside signals and circuiting. (You would need a transmitter at front and rear of the train so that if the tail end broke away it would be identified)
But would I have the confidence to hurtle at 125mph through busy junctions relying on a bunch of electrons in a supercomputer in Watford being right 100% of the time?
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