49 CFR § 271.3 - Application.
(a) Except as provided in paragraph (b) of this section, this part applies to -
(1) Class I railroads;
(b) This part does not apply to:
(1) Rapid transit operations in an urban area that are not connected to the general railroad system of transportation;
(2) Tourist, scenic, historic, or excursion operations, whether on or off the general railroad system of transportation;
(3) Operation of private cars, including business/office cars and circus trains;
(c) If a railroad contracts out significant portions of its operations, the contractor and the contractor's employees performing the railroad's operations shall be considered directly affected employees for purposes of this part.