Bang! The cars struck him again, causing the one on which he rode to wobble and swerve horribly; the wheels roared and flashed sparks as the flanges bit at the rails. The bonnet that covered the engine, crinkled up like a concertina; but the car held the track. Jim was still secure, while the second buffet had sent him well ahead. Better than all, he realized that he was now beyond the steeper part of the incline, while his engine was still pulling, urging the car backward. If only he could increase the pace, if only he could add to the distance which separated him from that long line of trucks bounding after him so ruthlessly. Then a groan escaped him; for along the Chagres valley, where, perhaps, in the year 1915 a huge lake will have blotted out the site of the railway along which he flew, and where fleets of huge ships may well be lying, there came the distinct, shrill screech of a whistle. Jim swung round in an agony of terror. He looked along the winding track and his eyes lit upon an object. It was the passenger train, loaded with human freight, standing in the way of destruction. CHAPTER XIV The Runaway Spoil Train Barely a mile of the double track of the Panama railway stretched between the inspection car, on which Jim was racing for his life, and the oncoming passenger train. Glancing over his shoulder he could see the smoke billowing from the locomotive and the escape steam blowing out between her leading wheels. Behind him there was the scrunch, the grinding roar, of the long line of steel wheels carrying the runaway spoil train. He kneeled on his driving seat and looked first one way and then the other, hesitating what to do. The rush of air, as he tore along, sent his broad-brimmed hat flying, and set his hair streaking out behind him. His eyes were prominent, there was desperation written on his face; but never once did he think of taking the advice which the megaphone man flung at him. "Jump for it! No! I won't!" he declared stubbornly to himself. "I'll stick here till there's no chance left; then I'll bring this machine up sharp, and leave her as a buffer between the spoil train and the one bearing passengers. Not that she'll be of much use. That heavy line of cars will punch her out of the way as if she were as light as a bag; but something might happen. The frame of this car might lift the leading wheels of the spoil train from the tracks and wreck her."