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During our childhood, we have read a good deal about flying chariots in may divine stories. Though we failed to trust it, we have now see people traveling by airplanes. Traveling is becoming so simple nowadays. The automobile industry has additionally undergone a lot of changes since the invention of steam engine vehicle. How many of you will know the Benz patent motor car of 1885 would be a motorized tricycle? Today we find millions of automobiles on the roads, in several models, shapes, sizes, colors, and prices.
It is also known as welding long rail line, which is a kind of line that welded normal rails without rail seam. The welding rail is not less than 200 meters long, and the actual application is usually 800~1000 meters or more. The long track is laid in the specified temperature range and fixed on the pillow. The long rail ends with a rail joint, while the middle part cannot scale up and down with the temperature. Therefore, there will be a great temperature pressure in the middle of the rail during the summer, which will produce a great temperature tension in winter. The greatest pressure on the rail and tension according to the years of rail laying and the highest temperature and minimum temperature calculation, rail tracks the maximum pressure should not cause to drum up by maximum tension should not cause rail fracture
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