Locomotives, mine cars, supply cars, shuttle cars and all other haulage equipment shall be maintained in a safe operating condition. An audible warning device and headlights shall be provided on each locomotive and each shuttle car. Rerailing devices and jacks shall be provided on all locomotives. Operators of haulage equipment shall sound a warning on approaching curves, intersections, doors, curtains, manway crossings, or any other location where persons are likely to travel.