What a neat idea. Many congratulations, Neil. May I suggest one little addition - they would look even better with a "sighting board" or "back-light-blocker" or whatever the purpose is of the flat plate usually surrounding a railway signal's lamp lens. Either the type with rounded ends or the oblong-with-the-corners-off ones, though the later would be easier to make. You'd just need a piece of thin sheet drilled out to slip over the lamp housings, so it shouldn't affect the wiring at all. Just a thought; please don't take it as criticism.