I was fishing at night by myself on the Dan river. It was about 2am when I saw a blue light coming down the river bottom on the same path as the RR tracks. At first I taught it was the train then realized there was no sound. The light followed the RR until it reached the edge of the river. The orb was in plain view for about a min. It looked to be about 10 ft. in diameter and glowed a bright blue. It suddenly shot straight up at a unbelievable rate of speed and was gone. I got my fishing gear together and went home.