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Wow, so the trains don't run on time, so they make the time run on the trains?

Not really. The second hand takes 58.5 second to move the entire circle at constant speed if I recall correctly. Then it stops for 1.5 seconds before it starts moving again. During that 1.5 second pause you close the doors of the trains. So it is more a method of synching the closing of the doors with the clock rather than actually gaining any time.

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