Ohio Revised Code Title XLIX. Public Utilities § 4951.52

No company or person owning or controlling any suburban or interurban railroad or street railway shall operate, use, or run, or permit to be run, used, or operated, for carrying passengers or freight on such suburban or interurban railroad or street railway, any car propelled by electricity, or any car or train of cars drawn by any car propelled by electricity, not equipped, in addition to the hand brake in such car or train, with an air or electric power brake so that the same can be operated and controlled by the motorman in charge of and operating such car or train.

The public utilities commission shall enforce this section.