“Wigwag” is the nickname of a type of railroad grade-crossing warning signal. The name comes from the pendulum-like motion it used to signal an approaching trailn. The center red light illuminated and with each swing of the “target” a mechanical gong sounded. The design and motion mimickes the swinging of a watchmans’ red lantern, swung in a side-to-side motion, the universal sign-language meaning STOP. The wigwag is in Hugo, Colorado.