Louis Brandeis, Southern Railway Company v. Watts…
“ The Legislature recognized that the difficulties inherent in valuing a railroad are great. It desired that the valuers should have access to every fact which might aid them in performing their duty. The data concerning the railroads referred to in the act, like the methods of valuation referred to in earlier and later legislation, are among those commonly used when an attempts is made to ascertain the value of a railroad. But they are merely aids. Such data are commonly in the possession of the railroad companies; and are often not readily accessible to others. ”
