A long time ago, I read a short story in which there was a man on a train who learns how to control the rolls that come up on dice. The way it's phrased is that he maintains a certain pattern in his mind, and as a result, the rolls of the dice always come up totaling seven. The story implied that the ability wasn't general telekinesis; it only influenced chance events into coming out a certain way.
The story ended with the implication that this would be a world-changing event, but it didn't go into the details.
If I had to guess, then I'd claim that Ray Bradbury wrote it, but I really have no idea. I read it some time around 1997, but the book or anthology was rather older than that. As best I can remember it had a 50s-to-60s feel.
Anyone have any idea what story this was?