Controlling 3 Aspect Signals on a Model Rail layout can be done with a Toggle Switch. Rotary switch, or automatically with magnetic switches. This Project uses a toggle switch to control the 3 aspect lights on a layout. The 3 aspect signal is Green, Yellow, & Red. Green at the top means 'All Clear' Yellow in the middle means 'Warning - next signal could be Red', and the Red means 'Stop,
Using a toggle switch requires the switch to have three 'ON' position and three lever positions. This is achieved with or MR313 switch. The terminals on
the base of the switch are numbered 1 to 6. Please follow these numbers on the drawing carefully as the sequence of wiring is important.