TRENTON, N.J., (AP) NJ Transit owes the federal government at least $271 million for the Hudson River rail tunnel that Gov. Chris Christie scrapped last month, a federal official said.

The $8.7 billion project to construct a rail tunnel between New Jersey and New York was 15 years in the making when Christie pulled the plug on Oct. 27, citing potential cost overruns.

The Federal Transit Administration on Nov. 8 sent the railroad the bill for the so-called Access to the Region’s Core project.

“NJT must immediately repay all the Federal financial assistance expended for ARC under the [work agreement] which is currently estimated to be $271.091 million, plus reasonable interest and penalty charges that will be determined by FTA,” regional administrator Brigid Hynes-Cherin wrote in the letter to James Weinstein, executive director of NJ Transit.

FTA also said it would launch an audit of the project to determine how much federal funds have not yet been spent.

The federal government had committed $3 billion to the project along with another $3 billion from the Port Authority of New York and New Jersey. The state’s share was $2.7 billion plus overruns.

The Federal Transportation Administration had agreed to spend $350 million for the tunnel. In the letter, it said it was “deobligating” the remaining $79 million of that commitment.

NJ Transit officials said Nov. 9 the agency would release a statement later. Officials weren’t saying where the state will get the money to pay the bill. However, $1.25 billion of the $2.7 billion the state had committed to the project from toll increases could soon become available.

At least one state — New York — is already going after the $3 billion that the federal government had committed to the Hudson River rail. U.S. Sen. Kirsten Gillibrand, D-NY, has asked Transportation Secretary Ray LaHood to redirect the money to the Long Island Rail Road’s East Side Access Project and the construction of the Second Avenue subway line.

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