Dwarf signal

If you want to have three states, red, green, and off, you need a SPDT center off toggle switch.  Wire the power (12 volts) to the center terminal of the switch, run a wire from each "on" terminal of the switch to the red & green bulb connections on the signal.  Run the common from the signal to the other side of the power (12 volts).

Ok The SPDT switch I bought has 3 prungs and the switch goes to : on- off- on  with 3 positions is this what I need?  thanks for your answer so quickly !

Your SPDT switch is replacing the "153C contactor" in the Lionel instruction sheet.

Thats great ! Thanks so much for your reply and great photo A very big help !

Stan is the man!

Thanks again gunrunnerjohn it worked out fine

Thanks Stan, he drew the nice picture.   I was too lazy to draw the picture.

Stan, what did you use to draw that?

I find Microsoft Paint works well for simple drawings. Cut/pasted images from JPG and PDF files, draw lines or simple shapes, make some text annotations, save as a JPG, upload to OGR. 

Thanks to you too stan Great pic !!!!!

Very clever Stan, I'll have to try that method for simple drawings, makes them easy to understand.