I'm not sure of the exact revenue split, but I think it might be a predetermined flat dollar amount, rather than a percentage. I'm just not familiar enough with shortline balance sheets to be able to state anything definitively. I'll ask someone when I have an appointment with them and let you know if it's flat or percentage based.
Everyone I have worked with just aren't really all that concerned with why your quote is higher, they just care that it is. When I tried to ship Portland and sand, the rate was astronomically high, even before we factored in the weight limitation, so we never made the moves by rail.
I've never really delved into just how the railroads put together their rates, I just know that the wait time is frustratingly long when I can get basically an instant quote from any trucking company.
Be well. Do good work.
Semperfidelis