CFR
- Title 1 - General Provisions
- Title 2 - Grants and Agreements
- Title 3 - The President
- Title 4 - Accounts
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- Title 47 - Telecommunication
- Title 48 - Federal Acquisition Regulations System
- Title 49 - Transportation
- Title 50 - Wildlife and Fisheries
57.12050—Installation of trolley wires.
Trolley wires shall be installed at least seven feet above rails where height permits, and aligned and supported to suitably control sway and sag.
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