sentences:  New York City's air raid sirens were literally falling down.New York City did have a good radio / TV public address system for the mayor, but it was unmistakably clear that up to eight million people in and around the city would die of burns, blast, flying debris, or radiation, and New England would get the fallout immediately after.New York City officials contemplate evacuation plans but scrap them because few people have cars, and civilian train operators cannot be counted on to work in a crisis.