Regarding evacuations .. read up what happened on the cruise liner at the weekend. I read (from memory) a man saw his wife into the lifeboat but was prevented from entering by the crew member as they were then full, to the alloted number. He found another boat and the two of them met up a few hours later on the island.
His wife said that, after he had done as he was told and gone away - a surge of more then ten further people swarmed into the lifeboat. That's how it will happen, be it train, car, coach, ship or plane.