I'm not sure if Cohen deserves to be listed under a superivestor in the way I like to use the term; however, he is running ~$12 Billion and his funds have been around for 15 years. Anyway he is accumulating a large stake in RAIL the largest railcar maker in the U.S.. RAIL certainly seems undervalued to me and has been a Magic Formula pick for the better part of a year.

Disclosure: I am long RAIL.