49 C.F.R. § 272.7
Coverage of a critical incident stress plan
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.