49 CFR 236.59 : 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) — Track Circuits (§ 236.51 To § 236.60) — Insulated rail joints.

4 Aug 2016

Insulated rail joints shall be maintained in condition to prevent sufficient track circuit current from flowing between the rails separated by the insulation to cause a failure of any track circuit involved.

49 CFR 236.59