StacksVerified U.S. regulatory reference

49 CFR §236.106

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each relay, the functioning of which affects the safety of train operations, shall be tested at least once every four years except:
  1. (a)Alternating current centrifugal type relay shall be tested at least once every 12 months;
  2. (b)Alternating current vane type relay and direct current polar type relay shall be tested at least once every 2 years; and
  3. (c)Relay with soft iron magnetic structure shall be tested at least once every 2 years.