Time and again we are told by those in charge of our railways that the ATP system that they have in mind is far too costly, requiring expensive computer equipment in every driving cab and at every signal. But the London Underground has a system of ATP which does not use computers - it uses the simplest of Edwardian technology - and it has worked very successfully for about ninety years. Why can't they use that?
Dr ARTHUR TARRANT
Twickenham, MiddlesexReuse content