There's talk of a 'once-in-a-lifetime storm' as subways and trains shut down and emergency crews prepare for the worstATLANTIC CITY, N.J. — Hundreds of thousands of people were told to flee low-lying areas, New York and Washington shut down their subways, federal offices and local schools closed, and presidential candidates curtailed their campaigning as Hurricane Sandy roared ever closer to the Eastern Seaboard on Sunday, promising epic storm surges, howling winds and drenching rain across much of the Mid-Atlantic region and Northeast.