The answer is that this is exactly what we've been doing under the MOU for the last few years. We have undertaken a number of very extensive technical studies to look at what reasonable standards for setback are, what reasonable standards are for the kinds of operations. It's not in the document you have today. As I said in my remarks, we will be publishing that document in the near future, because it is part of the guidance we intend to give to our friends in the municipalities and ourselves to manage issues at the local level.
It varies by the kind of rail operation you're talking about. Is it a mainline? Is it a subsidiary line? Is it a yard work? Is it a siding? There are a whole bunch of different factors that go into it.
I don't want to bore everybody in this room, but the railway business is a complicated business. I know it looks simple when you watch a train go down the road, but it's a lot more complicated than that.