MSHA - Code of Federal Regulations - 30 CFR 56.12042
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MSHA - Title 30 CFR
30 CFR § 56.12042
Track bonding.
Both rails shall be bonded or welded at every joint and rails shall be crossbonded at least every 200 feet if the track serves as the return trolley circuit. When rails are moved, replaced, or broken bonds are discovered, they shall be rebonded within three working shifts.