He shook loose the flag and waved it wildly over his head, still running forward. He even shouted, not realizing how puny his voice was. The engine grew larger and larger with amazing swiftness. He could hear the roar of the wheels; a shaft of steam leaped into the air, and, an instant later, the wind brought him the sound of a shrill whistle. He saw the engineer leaning from his window, and, with a great sob of relief, knew that he had been seen. He had just presence of mind to spring from the track, and the train passed him, the wheels grinding and shrieking under the pressure of the air-brakes, the drivers of the engine whirling madly backwards. He caught a glimpse of startled passengers peering from the windows, and then the train was past. But it was going slower and slower, and stopped at last with a jerk. When he reached the place, he found Jack explaining to the conductor about the broken fish-plates and the loose rail. What had caused it could not be told with certainty—the expansion from the heat, perhaps, or the vibration from a heavy freight that had passed half an hour before, or a defect in the plates, which inspection had not revealed. Allan sat weakly down upon the overturned hand-car. No one paid any heed to him, and he was astonished that they treated the occurrence so lightly. Jack and the engineer were joking together. Only the conductor seemed worried, and that was because the delay would throw his train a few minutes late. Half a dozen of the passengers, who had been almost hurled from their seats by the suddenness of the stop, came hurrying up. All along the line of coaches windows had been raised, and white, anxious faces were peering out. Inside the coaches, brakemen and porters were busy picking up the packages that had been thrown from the racks, and reassuring the frightened people. “What’s the matter?” gasped one of the passengers, a tall, thin, nervous-looking man, as soon as he reached the conductor’s side. “Nothing serious, I hope? There’s no danger, is there? My wife and children are back there—” The conductor smiled at him indulgently. “There’s no danger at all, my dear sir,” he interrupted. “The section-gang here flagged us until they could bolt this rail down. That is all.” “But,” protested the man, looking around for sympathy, and obviously anxious not to appear unduly alarmed, “do you usually throw things about that way when you stop?” “No,” said the conductor, smiling again; “but you see we were on a heavy down-grade, and going pretty fast. I’d advise you gentlemen to get back into the train at once,” he added, glancing at his watch again. “We’ll be starting in a minute or two.”