scope:

(a) This part prescribes minimum-

(1) Maintenance, inspection, and testing standards for highway-rail grade crossing warning systems;

(2) Standards for the reporting of failures of highway-rail grade crossing warning systems and for the actions that railroads must take when such systems malfunction;

(3) Requirements for particular identified States to develop State highwayrail grade crossing action plans; and

(4) Requirements that certain railroads establish systems for receiving toll-free telephone calls reporting various unsafe conditions at highway-rail grade crossings and pathway grade crossings, and for taking certain actions in response to those calls.

(b) This part does not restrict a railroad from adopting and enforcing additional or more stringent requirements not inconsistent with this part.