What do you think is the scariest story grandma told when she was a child?

When I was a child, I read a story in a magazine, which impressed me deeply and seemed to be true. It is said that there was an accident on a railway track that is now abandoned. A group of children played on it and a train came ... The result was, of course, no one lives. Later, this piece of railway track has been rumored to be haunted or something. A group of people parked their cars on the railway track in order to verify whether it was really so weird. There was no one outside the car, but after a while, they found that the dusty rear window was full of handprints of children's carts ... After reading this story, they were more moved than a little numb.