going train

American  

noun

Horology.

1. the gear train for moving the hands of a timepiece or giving some other visual indication of the time.

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Example Sentences

Nicole kept going. .. train our hearts to help those who might need . . . help.”

From Literature

But this watch is equipped with Lange’s signature fusee-and-chain transmission, which allows for more uniform transfer of energy from the mainspring barrel to the going train, and the watch also features a one-minute tourbillon with stop-seconds function, which means the tourbillon stops and the second hand switches to a “0” position every time you want to adjust the watch, thus allowing for more accurate setting.

From New York Times