SP Single Color Light Signal System query

Discussion in 'N / Z Scale Model Trains' started by Meiriongwril, Jul 9, 2006.

  1. Meiriongwril

    Meiriongwril Member

    Can anyone explain how the SP Single Color Light signals are used? If you have only one lamp, how do you show red/orange/green? Did they always come with one lamp above a second? - and if so, were two colors used together to mark a particular state of the road?
    Any help welcome on this![​IMG]
  2. SouthernPacific

    SouthernPacific New Member

    If im not mistaken, SP target signals have one bulb, and the red, yellow and green lenses either flip in front, or rotate around the bulb.

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