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Attached to these two controllers are the layout control switch boxes. To the left side of each speed regulator are #01681 controls; these have a momentary contact button, and are used to operate the track turnouts. Note that the crossover in the lower right is wired to have one 01681 operate both turnouts.
On the right side of both speed regulators are switch boxes which are used to control the movement of the trains. The 01682 switch boxes are used in conjunction with the color light signals, each of which control a segment of track. As a train approaches a red signal, it enters the controlled segment of track and stops. The 01683 switch boxes are used to allow trains moving in one direction to pass by a red signal set for the opposite direction.
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