49 CFR 236.11 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 200.1 To Parts 273-299) — Other Regulations Relating To Transportation (Continued) (§ 200.1 To Parts 273-299) — Federal Railroad Administration, Department Of Transportation (§ 200.1 To Parts 273-299) — Rules, Standards, And Instructions Governing The Installation, Inspection, Maintenance, And Repair Of Signal And Train Control Systems, Devices, And Appliances (§ 236.0 To Appendix F To Part 236) — Rules And Instructions: All Systems (§ 236.1 To § 236.110) — General (§ 236.1 To § 236.18) — Adjustment, repair, or replacement of component.

4 Aug 2016

When any component of a signal system, the proper functioning of which is essential to the safety of train operation, fails to perform its intended signaling function or is not in correspondence with known operating conditions, the cause shall be determined and the faulty component adjusted, repaired or replaced without undue delay.

49 CFR 236.11
[49 FR 3382, Jan. 26, 1984]