Can signals actually have a beam projecting from their lenses and certain flare/scintillation effect to make them better visible from a distance?
Can the locomotive headlight flare be put on signals?
AFAIK the default BNSF signals don't have any projection as there a no emitter child objects in their bins.
It seems that the lighted lens and faint glow are coming from the shapefile node and textures.
I suppose one can add three emitters (red/yellow/green) and script them to light up with the proper indication.