Dice-O-Matic hopper and elevator
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So are the trains kept in sync with the schedule by their onboard computers or radio signals from an atomic clock or NTP servers over wireless? No. They are actually kept in sync by windable gold clockwork watches, which each conductor keeps with him and places in a special gold clockwork watchholder on the dashboard of his modern technological marvel.
Its partially for historical reasons and partially for aesthetic sensibilities, although I know at least one Japanese railroad engineer who says it is a safety feature. I think that is largely a justification so that he doesn't have to say "We sync the trains with gold clockwork watches because we wanted to sync the trains with gold clockwork watches, as trains were meant to be synced!"
I want to see a probability distribution graph for this behemoth! It would be very cool (well, in a geeky-cool sort of way) to compare it with various 'strong' crypto RNGs...