New Jersey has spent nearly $600 million on a new $8.7 billion passenger-rail tunnel called the Access to the Region’s Core, but Gov. Chris Christie may ­terminate the project due to escalating costs.

The new ARC tunnel will run from the New Jersey township of North Bergen, under the Hudson River to midtown Manhattan, and double New Jersey Transit’s rail capacity. Christie has said that federal officials estimate the project could cost $2 billion to $5 billion more than the current $8.7 billion price tag and New Jersey cannot afford the extra expense.

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