On 20 Nov 2011, at 1138, Poul-Henning Kamp wrote: > In message <[email protected]>, Ian Batten > wri > tes: > >> 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. > > I would expect the relevant technical case to be high-speed passenger > trains, travelling at up to 90m/s and where the entire train can > pass over a point on the track in as little as two and a half second.
Which isn't a use-case for passing times being measured manually at manual signal boxes and manually written onto paper sheets for manual analysis, of course. ian _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
