Is NS using some kind of new signal? I have not seen any around close to me, but out in Vermilion, Oh there is a signal, that is a square, probably 18" on a side,lights are LED's that flash either a red "X" or a green "X". They are next to grade crossings and very near regular signals. Oh yeah, they are mounted on poles about 15 to 18 feet tall. This signal also happens to be at a 'no whistle' grade crossing. Any one tell me what these are for?