Paul J. Ste. Marie said:
> The dispatchers and tower operators at the time had 
> huge paper sheets and the time each train passed a waypoint on the track 
> was logged. I don't remember if it was to the second on the paper forms, 
> but I wouldn't be surprised. The dispatch system certainly did so. The 
> waypoints were typically 1/4 to 1/2 mile apart, at towers, 
> interlockings, and the like.

Hmm. In the UK the working timetable (not the public one) is written to a
precision of half a minute.

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