No person owning or operating any elevated railroad shall allow or permit any of the cars owned or operated by him to be shunted or run down inclines from the elevated structure to the surface of the ground, unless such cars are under the absolute control of a competent motorman or engineer, or person acquainted with and competent to operate the motor machinery of such car. No car shall be allowed or permitted by any person operating or owning the same to be shunted or run down any such incline, unless the motor machinery of the same can be controlled so as to decrease the rate of speed of such car while running down such incline. No car shall be run down such incline at a rate of speed greater than ten miles per hour.
(Prior code § 188-37)