For obvious reasons, I can't mention any names. Let me think how I'll put this.
It would not be out of the realm of the possible for a railway with market power to say to a shipper, “You can either have a five-year contract with increases of 15%, 15%, 5%, 9%, or something in that range, or you can ship without a contract and we're going to ding you 50% from one year to the next.”