Rejecting an attack on a rule of the Interstate Commerce Commission obliging all carriers to observe requirements with respect to assigning cars at coal mines, Justice Brandeis observed that "in establishing a rule of general application, it is not a condition of its validity that there be adduced evidence of its appropriateness in respect to every railroad to which it will be …

No more was required to justify the application to these areas of Congress' express powers under the Fifteenth Amendment.

As the record affords a sufficient basis for the Commission's determination, it is not subject to review in the courts.

This Court has no concern with the correctness of the Commission's reasoning on the evidence in making its findings of fact, since it applied the rules of substantive law prescribed by Congress and reached its findings of actual value by the exercise of its judgment upon all the evidence, including enhanced construction costs.

Such regulations which affect or determine rights generally even though not directed to any particular person or corporation, when lawfully promulgated by the Interstate Commerce Commission, have the force of law and are orders reviewable under the Urgent Deficiencies Act.

The credibility of witnesses and weight of evidence are for the Commission and not for the courts, and its findings will not be reviewed here if supported by evidence.

Where the proceedings are quasi legislative in character, a hearing of a judicial type is not required; a hearing allowed by legislative grace is not circumscribed by the restrictions applicable to judicial or quasi judicial adversary proceedings

The obligation has never since been doubted, and the power to regulate it is exclusively vested in the Commission.

See also decisions treating as "justiciable" bills to enjoin regulations which create duties immediately enforceable by imposition of penalties.

"It is not for courts to weigh the evidence introduced before the Commission*** or to enquire into the soundness of the reasoning by which its conclusions are reached,*** or to question the wisdom of regulations which it prescribes.***"