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To issue a scheduling order for line and bifurcation speed limit, you must specify the mileage (including the stop line and the switch number) and the time. Issuing accident rescue orders, monthly construction plans or construction cables involving the speed limit of the relevant lines, bifurcation must indicate the mileage.
Signs of birth. Since the middle of the 20th century, technology has grown faster and faster. It was only six and a half years since the discovery of uranium fission in January 1939 to the first atomic bomb exploded in July 1945. The emergence of electronic computers has led to more profound changes in the fields of human social life. These technological breakthroughs can be called technological revolutions
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