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50 FR 4054, Jan. 29, 1985, unless otherwise noted.
53 FR 32521, Aug. 25, 1988, unless otherwise noted.
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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.