What is the name of that show?

I am looking for the name of an old television show. It aired on PAX TV, usually right after Touched By An Angel, it was about a college professor who would investigate paranormal activity. Usually the investigation would yield a Scientific explanation but would always have something that would leave you wandering if it was natural and explainable or paranormal. I remember one episode was about a haunted train track where some children were killed on a school bus. People's cars would die on the spot where the bus was hit, the sound of a train coming could be heard as well as children crying. Then all of a sudden the cars would roll forward off the tracks and little hand prints would be on the bumper. Does anyone know the name of this show? It is really annoying me that I cannot remember it, I loved the show.