Oh that one. Yeah, there are only red lights. I saw one train come across the bridge, and it was moving towards me, so it wasn't going against the red. Anyway, let me look it up.
"There is no national standard or system for railroad signaling in North America. Individual railroad corporations are free to devise their own signaling systems as long as they uphold some basic regulated safety requirements."
http://www.railroadsignals.us/basics/basics4.htm
So it's hard to say. But modern lights use LED's so what looks like a single red light, maybe change to yellow or green.
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"There is no national standard or system for railroad signaling in North America. Individual railroad corporations are free to devise their own signaling systems as long as they uphold some basic regulated safety requirements."
http://www.railroadsignals.us/basics/basics4.htm
So it's hard to say. But modern lights use LED's so what looks like a single red light, maybe change to yellow or green.