49 C.F.R. § 218.129
(a) Application of this section. A railroad is not required to comply with the requirements in this section for each one-person train crew operation subject to an exception covered by § 218.125 or § 218.127. The following train operations may be operated with a one-person train crew subject to the requirements in this subpart:
(1) Each Class II or III railroad's legacy one-person train crew freight operation that has been established for at least two years before June 10, 2024, may continue to operate with a one-person train crew, including continuing to transport hazardous materials of the types or quantities specified in § 218.123(c), if:
(i) No later than September 6, 2024, the railroad:
(2) Each Class II or III freight railroad seeking to initiate a train operation staffed with a one-person train crew not transporting hazardous materials of the types or quantities specified in § 218.123(c) shall:
(3) Each railroad seeking to continue or initiate work train operations with a one-person train crew, including operations involving a work train traveling to or from a work site, shall:
(4) Each railroad seeking to continue or initiate helper service train operations with a one-person train crew, including operations involving a helper service train traveling to or from a work site, shall:
(5) Each railroad seeking to continue or initiate a lite locomotive train operation staffed with a one-person train crew, excluding an MU locomotive operation, shall:
(b) Written notice requirements. The written notice shall be submitted by email to FRAOPCERTPROG@dot.gov and, at a minimum, include the following:
(c) Additional requirements. Each railroad with an applicable one-person train crew operation shall:
(1) Adopt and comply with an operating rule that satisfies the requirements of this paragraph to ensure rail employees can take mitigation measures that provide a level of safety that is as safe or safer than a two-person train crew operation to address certain situations with the one-person train crew operation.
(i) At a minimum, the operating rule shall address the following types of situations:
(ii) At a minimum, the operating rule shall:
(2) Adopt and comply with an operating rule that satisfies the requirements of this paragraph to ensure radio or wireless communications with a one-person train crew is as safe or safer than a two-person train crew for train operations and crewmember safety. At a minimum, the operating rule shall require that:
(3) Adopt and comply with an operating rule that satisfies the requirements of this paragraph to ensure: