CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 200–269) > PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES > SUBPART A—Rules and Instructions: All Systems (§236.1 to §236.110) > 236.106—Relays.

236.106—Relays.

Each relay, the functioning of which affects the safety of train operations, shall be tested at least once every four years except:
(a) Alternating current centrifugal type relay shall be tested at least once every 12 months;
(b) Alternating current vane type relay and direct current polar type relay shall be tested at least once every 2 years; and
(c) Relay with soft iron magnetic structure shall be tested at least once every 2 years.
[49 FR 3384, Jan. 26, 1984]