I really don't want to crap all over your cake, but I should at least mention that the railroads are, for the vast majority, government-established monopolies. The ones that weren't were driven out of business for not playing the fed games. Don't have any references, but I've heard the spiel a couple times. Basically, most of the railroad system was created by government fiat. Maybe someone else has more details.
That said, the government has intermingled with everything, so you can hardly blame an honest railroad business today for what happened 150 years ago. I did want to point that tidbit out, though.