We don't base the rate on commercial rates. First off, there is no one commercial rate, there are all kinds of contracts that go back and forth, and price is determined on a transaction-by-transaction basis. These are effectively shipping contracts between a shipper and a carrier, and they vary from commodity, from time...there are a number of aspects. In determining what the rate is, we take all of the costs into account of what it would take to move over a particular distance. So you have things like depreciation, cost of fuel, you have all the costs that a railway would undertake and, to be fair, we add in profit as well, because companies have to make a profit.
So there's a very complicated determination using a great number of variables, but we do it from the bottom up, and that's what we determine the rate on. And again, that rate is part of the interswitching regulations, which is something that we can review on an as-needed basis as well.