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The single arm absolute signals include a single marker for the stop and stay indication. I have mapped the single red marker to lunar so that a signal decoder such as the Team Digital SHD2 can drive the entire signal off 4 outputs.
The rule book illustrates two versions of the NW CPL dwarf. Early versions of this style dwarf had the arc from 12 to 3-o-clock position. Due to clearnance issues, the arc was change to the 9 to 12-o-clock position. I don't know if this changed the aspects the signal could display. I am assuming that either version could display the up to 4 aspects. There is a stop and proceed version that includes a numbner plate. The left lower red light is mapped to lunar based on the later version of the signal.
These signals encompass the all of the non color position light signals. The rule book does not really make a distinction between the types of signal heads. The images in the rule book are drawn as possible semaphore signals with the exception of the indications which have a lunar light. In those rules, separate signal images were drawn without semaphore blades showing the lunar aspect.
I believe the signals with lunar aspects are of Wabash origin. They allow for a complete set of aspects with two arms in locations that would typically take three.
See the aspect page.
Signal Mast definitions:
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