The critical incident stress plan of a railroad subject to this part shall state that it covers, and shall cover, the following individuals employed by the railroad if they are directly involved (as defined in § 272.9) in a critical incident:

(a) Railroad employees who are subject to the hours of service laws at—

(1) 49 U.S.C. 21103 (that is, train employees not subject to subpart F of part 228 of this chapter regarding the hours of service of train employees engaged in commuter or intercity rail passenger transportation);

(2) 49 U.S.C. 21104 (signal employees); or

(3) 49 U.S.C. 21105 (dispatching service employees);

(b) Railroad employees who are subject to the hours of service regulations at subpart F of part 228 of this chapter (regarding the hours of service of train employees engaged in commuter or intercity rail passenger transportation);

(c) Railroad employees who inspect, install, repair, or maintain railroad right-of-way or structures; and

(d) Railroad employees who inspect, repair, or maintain locomotives, passenger cars, or freight cars.