49 CFR 242.3: Application and responsibility for compliance.

(a) This part applies to all railroads, except:

(1) Railroads that operate only on track inside an installation that is not part of the general railroad system of transportation (i.e., plant railroads, as defined in § 242.7);

(2) Tourist, scenic, historic, or excursion operations that are not part of the general railroad system of transportation as defined in § 242.7; or

(3) Rapid transit operations in an urban area that are not connected to the general railroad system of transportation.

(b) Although the duties imposed by this part are generally stated in terms of the duty of a railroad, each person, including a contractor for a railroad, who performs any function covered by this part, must perform that function in accordance with this part.