The wheel train is part of the watch movement, containing all of the geared wheels that drive the hands and complications. These gears transfer torque from the barrel to the escapement wheel.
The wheels are usually held in place by bridges or cocks connected to a plate. High-torque wheels are usually anchored with jewels (and sometimes chatons) though other wheels may rest in simple holes. The balance wheel usually also has an anti-shock device to anchor its staff.
The wheel train includes
The main gear train of the timepiece is known as the going train. These wheels transmit torque from the mainspring to drive two primary functions
The going train consists of three or four main gears or wheels
The motion work moves the hands and is driven by the second wheel (also often called the center wheel). It includes a 12 1 reduction gear train to drive the hour hand from the minute hand and is often located just behind the dial.
The motion work consists of the following gears or wheels
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