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I believe that is specifically a Swift train order signal. NP used these on branch lines and one can be seen at the Snoqualmie, WA depot/museum. The signal provided two indications, stop (red) and proceed (white or green). Some also had a light at the top with similar indications for night-time visibility. 

At some stations, NP sometimes needed a third aspect (i.e. "Form 19") in addition to STOP ("Form 31") and proceed (no orders) aspects. For a Form 19 yellow aspect, NP operators would set the signal to the STOP position, and hang a yellow lantern from the signal. There was a hole drilled in the outermost "paddle" of the signal from which to hang the lantern.  (A Form 19 order does not require the engineer to stop the train in order to receive it. They were typically hooped up on the fly to the engine crew and conductor.) 

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