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科学家的一些大胆预想将在下个世纪变为现实。列车飞驰在圆管内科学家们预言:管道列车将成为21世纪铁路发展的方向。所谓管道列车,就是把大口径的钢管埋在地下,让圆管状的列车在圆管内运行。这种列车不需要发动机,依靠空气推动前进。专家们设想:用电动真空阀门,将管道分成段,每段都设有真空泵和空气进口,当列车前部的管道被抽为真空后,由于列车后部依然有空气,空气就能推动列车前进。如果列车后部不断补充空气,加大推力,列车就会加速前进。同样的道理,当列车后方的管道里形成局部真空时,列车就能减速停车。跨洋引水到沙漠南美洲的淡水过剩令非洲国家羡慕。科学
Some bold predictions by scientists will come true in the next century. Train speeding in the tube scientists predict: pipeline trains will become the 21st century railway development. The so-called pipeline trains, is the large-diameter steel pipe buried in the underground tube-shaped train running in the tube. The train does not require an engine and relies on air to move forward. The experts envisaged: the use of electric vacuum valves, the pipeline is divided into sections, each with a vacuum pump and air inlet, when the train front of the pipeline was drawn into a vacuum, because the rear of the train is still air, the air will be able to promote the train forward . If the back of the train constantly replenished the air, increase the thrust, the train will speed up. By the same token, trains can decelerate to a stop when a partial vacuum is formed in the pipe at the rear of the train. The surplus of fresh water from the trans-ocean diversion into the desert of South America is what envy African countries. science