Just for kicks, let's discuss fusees. The most common ones I've dealt with are 5-minute or 10-minute red ones. But Canadian roads used to use 10 minute yellow ones, and the C&O, even in the mid 1960's, had green fusees. I've also read about, but never seen, ones from longer ago which changed color - burned red the first 5 minutes, then yellow for 5 more.
In today's world fusees are seldom left burning to protect against following trains because of radios, and also less often used for passing signals while switching, again because radios are more common. So there is probably little demand for exotic colors, just plain red for highway protection etc. But it used to be common to pass signals for a hitch to an engineer 70 carlengths away using a fusee. If it was the final double to your train, once the hitch was complete you'd throw the fusee as high up in the air as you could, it would come down and go out and the engineer would know you were airing them up and had no further move at that time.
Anybody have anything to add?
In today's world fusees are seldom left burning to protect against following trains because of radios, and also less often used for passing signals while switching, again because radios are more common. So there is probably little demand for exotic colors, just plain red for highway protection etc. But it used to be common to pass signals for a hitch to an engineer 70 carlengths away using a fusee. If it was the final double to your train, once the hitch was complete you'd throw the fusee as high up in the air as you could, it would come down and go out and the engineer would know you were airing them up and had no further move at that time.
Anybody have anything to add?