For the Gateway Tunnel, they will dig and assemble the new tunnels and then rehab the old tunnels, eventually resulting in four tunnels under the Hudson.
The long term plans for the Portal Bridges over the Hackensack River are for there to be a Portal North and a Portal South Bridge giving four tracks over the river.
Is there a possibility that when the Portal North Bridge is finished, to continue to use the old bridge as the 3rd and 4th tracks until the Portal South Bridge is completed?
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