Ian Batten said: >>> This wasn't the timetable. Its main purpose, as I understood it, was to >>> provide a record of where trains were, or where the dispatchers thought >>> they were, in the event of an accident.
>> Hmm, they may well be logging each track circuit transition > Track circuits? In manually-signalled USA? The USA had track circuits well before the UK. Read Rolt. I thought it was fairly usual to track circuit at least sections of lines - for example, in remote areas signals were approach-lit to save battery life, so that implies several TCs in rear of the signal. > Anyway, the average freight train in the USA is 6500 feet long (ie > substantially over a mile) and travels at an average of around 20mph, or at > most 30mph. So it takes around two minutes to pass a point. Timing that to > a precision of a second seems a excessive. True. -- Clive D.W. Feather | If you lie to the compiler, Email: cl...@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646 _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
