"going train"
by cm

Going Train of a late-17th century Clock
Creative Commons AttributionGoing Train of a late-17th century Clock - Credit: takomabibelot, Flickr
The going train is the main gear train – or system of gears to transmit rotational torque – in a clock.   It consists of a set of wheels that connect the power source (a spring or a weight) to the escapement which drives the pendulum or balance wheel.