SP Single Color Light Signal System query

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

  1. Meiriongwril

    Meiriongwril Member

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    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

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    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.
    Thom