It's been called the most urgent infrastructure program in America -- but for decades, the Gateway Program has been on hold. The $30-billion project would see a dramatic upgrade to transportation infrastructure in the most heavily used section of the Northeast corridor rail system.A new tunnel under the Hudson River is a key element. Hari Sreenivasan reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
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