what makes a railroad a class 1 and what are the other categories? csx is a class 1, right? why becuase they are a major company?
Class 1 RRs (my best guess) make more than $250 million annual revenue.
Class 2 RRs make between $20 and $250 million annually.
Class 3s and beyond ... well ... I won't BS you. I don't know.