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What gates are installed on the tunnels?

April 26, 2017gates installed tunnels

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What gates are installed on the tunnels?

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The inlets of the two outer tunnels are permanently closed with 50- by 50-foot bulkhead gates. Each gate, with steel frame, weighs about 3,000,000 pounds, and required 42 railroad cars for shipment. At the outlets of the two inner tunnels, 50- by 35-foot Stoney gates are installed. These gates can be closed when the tunnels need to be emptied for inspections or repairs.