Reed Switches and Magnets | Railwayscenics
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Reed Switches and Magnets

Magnetic Reed Switches are long thin wire-like switches that are activated by the presence of a magnet. You can place one of these under the track rails between the ties and place a small magnet on the bottom of a railcar, so that when the railcar with the magnet travels over the switch, the device that the switch is connected to will be activated (e.g, a light in a building, a section of track or an animated device).