49 CFR § 236.309
Loss of shunt protection; where required
November 18, 2020
(a) A loss of shunt of 5 seconds or less shall not permit an established route to be changed at an automatic interlocking.
(b) A loss of shunt of 5 seconds or less shall not permit the release of the route locking circuit of each power-operated switch hereafter installed.
[49 FR 3385, Jan. 26, 1984]
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