Charles Evans Hughes, Wood v. Vandalia Railroad Company…
“ It is sufficient to say that the case cited cannot be regarded as affording basis for a contention that a ratio of expense to earnings on the entire business of a railroad, or of a division, can be taken to show the cost of some particular item or class of traffic, in the absence of evidence with respect to that traffic which would warrant the conclusion that its cost in proportion to the revenue therefrom could properly be expressed. ”
