The New Jersey and Manhattan under Hudson River is Urgent

Typical need for government intervention.
Chris Christie's decision to kill the costly project, started a year ago, sets off a scramble to change his mind.
Every two minutes during rush hour, a commuter train bound for Manhattan squeezes through a 100-year-old tunnel under the Hudson River. The trains are almost always packed as they head into Penn Station, the busiest hub in America.
Chris Christie terminated the ARC tunnel project, designed to double commuter rail capacity between the Big Apple and the Garden State, citing excessive costs
Paul Krugman rightly gives Chris Christie hell for dropping out of the Hudson River rail tunnel project, the largest infrastructure project in the country. He explains that this is probably the worst possible time to cancel