Nice work. What are the large brass things you are holding in your hand. If I had to guess I would say they are feet?
Thanks. Those brass things started out as round brass plugs and were put on a lathe and threaded on one end (that's the photo you see in the hand). Then we put them in the CNC machine and made the brass thumbscrews out of them. The one photo of the three thumbscrews shows an original one in the middle and new ones by it. I couldn't find any original ones and needed 32 of them, so me and buddy made some out of round bar stock from a metal yard.
Others are right that the concept of the yellow light was a later edition and first signals were red/green. They did devise an overlap of the two colors that worked as a "yellow". Meaning the green would phase to red and green before going to red only.
Thanks for all the compliments. Here are a couple more of the old signals that I have or have had..
Edited by rumbleseat, April 12, 2015 - 04:07 PM.