New Jersey's public transit agency
The breakdown appears to put an end to efforts to revive some form of the rail tunnel project, once projected to be the largest U.S. infrastructure project and a potential source of economic stimulus.
Amtrak had been in talks with New Jersey's public transit agency about a possible alternative to the $8.7 billion tunnel that New Jersey Governor Chris Christie killed last month.
But those negotiations broke off during the past week, removing any prospect that the two agencies would cooperate to build a trans-Hudson tunnel, Amtrak spokesman Cliff Cole said
