Well, as I understand it, the need for data is all about getting your head around what the railways have available in any particular part of the country in terms of rolling stock, etc., and how it's being used. You would have a reasonable expectation, if you ordered up some rail service, of what they would be able to provide.
This is what I took away from some of the earlier comments, not just today but in previous studies. If I'm not headed down the right track on that one, tell me what kind of data would be most useful to you going forward.