Charles Evans Hughes, Louisville Nashville Railroad Company v…
“ The rate-making power necessarily implies a range of legislative discretion; and, so long as the legislative action is within its proper sphere, the courts are not entitled to interpose and upon their own investigation of traffic conditions and transportation problems to substitute their judgment with respect to the reasonableness of rates for that of the legislature or of the railroad commission exercising its delegated power. It may be assumed that the statute of Kentucky forbade arbitrary action ”
