Plain metal. The warn sign is about 250 ft down track from it. So far its on the only one I can find, but at least I know what to look for now.
"Just post some random unrelated text. We have members here who can help you with that." ~ Chacal "When all else fails, read the instructions... if that doesn't work either, try following them." ~ Old Prof The Grade Crossing - Atlanta North Project - Virtual Rail Creations