Summary

Pierce Butler New York Central Company v. United States…

While on the air line having their brakes cut out, such cars are to be distinguished from hand-braked cars. Because they have no power line, it is impossible, within the meaning of the act, to associate hand-braked cars with cars equipped with power brakes operated by the engineer. And, when not a part of the air line, power-braked cars whose brakes will not work are not so associated. When placed to the rear of the cars having their brakes operated by the engineer, the air line on such cars cannot be used to operate any brakes on the train.
Source: Wikisource

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