NEW YORK -- From Washington to Boston, big cities and small towns yesterday buttoned up against the onslaught of a superstorm that could endanger 50 million people in the most heavily populated corridor in the nation, with forecasters warning that the New York area could get the worst of it -- an 11-foot wall of water.

"People need to be acting now," Federal Emergency Management Administrator Craig Fugate said as Hurricane Sandy made its way up the Atlantic on a collision course with two other weather systems that could turn it into one of the most fearsome storms on record in the United States.

Forecasters said the hurricane could blow ashore tonight or early Tuesday along the New Jersey coast, then cut across into Pennsylvania and travel up through New York State on Wednesday.

Airlines canceled more than 5,000 flights and Amtrak began suspending train service across the Northeast. New York, Philadelphia, Washington and Baltimore moved to shut down their subways, buses and trains, and said schools would be closed today.

Boston also called off school. And all nonessential government offices closed in the nation's capital.

As rain from the leading edges of the monster hurricane began to fall over the Northeast, hundreds of thousands of people from Maryland to Connecticut were ordered to evacuate low-lying coastal areas, including 50,000 in Delaware and 30,000 in Atlantic City, where the city's 12 casinos were forced to shut down for only the fourth time ever.

"We were told to get the heck out. I was going to stay, but it's better to be safe than sorry," said Hugh Phillips, who was one of the first in line when a Red Cross shelter in Lewes, Del., opened at noon.

"I think this one's going to do us in," said Mark Palazzolo, who boarded up his bait-and-tackle shop in Point Pleasant Beach, N.J., with the same wood he used in past storms, crossing out the names of hurricanes Isaac and Irene and spray-painting "Sandy" next to them. "I got a call from a friend of mine from Florida last night who said, 'Mark, get out! If it's not the storm, it'll be the aftermath. People are going to be fighting in the streets over gasoline and food.' "

Sandy, a Category 1 hurricane with sustained winds of 75 mph as of yesterday evening, was blamed for 65 deaths in the Caribbean before it began traveling northward.

In Washington, President Barack Obama promised the government would "respond big and respond fast" after the storm hits.

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