If said person or his agent is able to prove that it was physically impracticable for him or his agent to comply with the standard of car loading required, owing to unusual or extraordinary physical conditions not under his control, such as crashes, breaking wires, or blockades resulting in obstruction of right-of-way, or by reason of severe storms, or that the failure to comply with the said standard of car loading was due to unusual conditions, or to abnormal traffic conditions arising from such causes as conventions, open-air gatherings or other similar large assemblies, then such person or his agent shall not be held to be in default of the car-loading provisions of this chapter, but any such person or his agent shall not be permitted to claim immunity by reason of physical causes hereinbefore mentioned unless he or his agent is able to prove that any car passing a checking point has been delayed behind its schedule time for a period of ten minutes or more, and then only in the event that such delay or delays shall have occurred within a period of one hour prior to the beginning of the period at which the car loading was being checked at said checking point.
(Prior code § 188-25; Amend Coun. J. 11-17-21, p. 41319, Art. V, § 8)