49 CFR § 236.56
Shunting sensitivity
November 18, 2020
Each track circuit controlling home signal or approach locking shall be so maintained that track relay is in deenergized position, or device that functions as a track relay shall be in its most restrictive state if, when track circuit is dry, a shunt of 0.06 ohm resistance is connected across the track rails of the circuit, including fouling sections of turnouts.
[49 FR 3383, Jan. 26, 1984]