YOU don’t get to be the world’s second richest man and one of the world’s most successful investors by making bad investments. So Warren Buffett’s audacious decision to sink a cool $US 34 billion into one of North America’s largest railways, BNSF, is a huge vote of confidence in the future of rail transport. It is not that long ago that investors of the calibre of Buffett would not have touched railway stock with a barge pole, and for sure, they would have lost their shirts.