MSHA - Code of Federal Regulations - 30 CFR 75.508-1
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MSHA - Title 30 CFR
30 CFR § 75.508-1
Mine tracks.

When mine track is used as a conductor of a trolley system, the location of such track shall be shown on the map required by §75.508, with a notation of the number of rails and the size of such track expressed in pounds per yard.