Summary

Charles Evans Hughes Louisville Company v. United States…

Indeed, the few ticket passengers sometimes riding in the private car of another carrier could probably be accommodated in other equipment that must be hauled anyhow, and the transporting carrier would receive more revenue if they rode in an ordinary Pullman car. Under these circumstances a carrier hauling the private car of another line can not be said to have hired its use, as it would have no interest in doing so and pays no rental therefor. Even if car hire should be provided on private cars, it would obviously be a mere subterfuge which could not change the legality of the practice.
Source: Wikisource

Charles Evans Hughes Louisville Company v. United States…

It is said that, in view of the nature of the subject of the transportation, and especially in the light of past administrative construction, the act should be construed as not forbidding the free transportation of the cars in question, and that, if it is lawful to move the carrier owned car free, no unlawful discriminatory conditions arise from the difference to treatment of privately owned cars.
Source: Wikisource

Charles Evans Hughes Louisville Company v. United States…

Even then the revenue from a passenger car used exclusively by a special party must be sufficient to warrant its transportation. * * * The transportation of a private car of another carrier is ordinarily for the benefit of the owning line or its officials and not for revenue purposes. While ticket passengers may sometimes occupy such a car, they do so by invitation, and the carrier performing the transportation is not at liberty to make use of the car by putting other passengers in it.
Source: Wikisource

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