MSHA - Code of Federal Regulations - 30 CFR 56.9319
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MSHA - Title 30 CFR
30 CFR § 56.9319
Going over, under, or between railcars.

Persons shall not go over, under, or between railcars unless:

(a) The train is stopped; and

(b) The train operator, when present, is notified and the notice acknowledged.