How Will the Proposed $20B New Hudson Tunnel Be Financed?

Regarding the creation of the Gateway Development Corporation, just how will they manage to finance the proposed $20 billion new Hudson Tunnel?
How Will the Proposed $20B New Hudson Tunnel Be Financed?
A conductor drives an Amtrak train on Feb. 8, 2011, outside of Newark, New Jersey. Amtrak, a government-owned corporation, has joined up with New Jersey's two U.S. senators to propose a new rail link to New York City under the Hudson River. The 'Gateway Project' would include two tunnels under the Hudson River and increase the train traffic under the river from 62 trains per day to 92. This plan is looked at as an alternative after N.J. Governor Chris Christie killed another rail link plan in 2010 after he deemed it too costly to New Jersey residents. Spencer Platt/Getty Images
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Dear Editor,

Regarding the creation of the Gateway Development Corporation, just how will they manage to finance the proposed $20 billion new Hudson Tunnel?