MSHA - Code of Federal Regulations - 30 CFR 56.14214
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MSHA - Title 30 CFR
30 CFR § 56.14214
Train warnings.


A warning that is audible above the surrounding noise level shall be sounded--

(a) Immediately prior to moving trains;

(b) When trains approach persons, crossings, other trains on adjacent tracks; and

(c) Any place where the train operator's vision is obscured.