In case any passenger on any railroad shall be injured while on the platform of a car while in motion, or in any baggage, wood or freight car, in violation of the printed regulations of the corporation posted up at the time in a conspicuous place inside of its passenger cars then in the train, such corporation shall not be liable for the injury, if it had furnished room inside its passenger cars sufficient for the accommodation of its passengers. R.L. 1910, § 1423.
Oklahoma Legal Code