An individual who is injured while boarding or attempting to board a moving locomotive or railroad car, without authority from the owner or operator of the railroad, or who having boarded a locomotive or railroad car without authority from the owner or operator of the railroad, is injured while riding or getting off the locomotive or railroad car, may not recover any damages from the owner or operator of the railroad for that injury unless the injury is proximately caused by an intentional act of the railroad owner or operator and the railroad owner or operator knew that serious injury was the probable result of the act, or that the owner or operator of the railroad acted with wanton and reckless disregard of the probable result of the act. This section does not exempt a railroad corporation from any liability created under chapter 49-16 or the federal Employer’s Liability Act [45 U.S.C. § 51 et seq.] for injuries to its employees or agents.