Narrow-gauge railway lines are divided into: * external connecting businesses with other companies, raw material bases, harbors, railway stations of 1520 mm * internal – inside the plant and enterprises and connecting road, designed to train and shunting operations. In accordance with snip 2.05.07-95 'Industrial Vehicles' depending on the annual congestion of narrow-gauge railways are divided into three categories (1 – more than 0,5; ii – from 0,2 to 0,5 and iii – 0,2 million ton or less per km, and the wood-ways, depending on the amount of forest). Minimum curve radii are allowed depending on the categories in especially difficult circumstances on the external and internal routes with train operation, respectively, 200, 150 and 100 meters, and on the interior of 60-80 m. Circular curves are interfaced with the direct transition curves. Narrow gauge rails are made of open-hearth steel in accordance with gost. They are divided into two varieties depending on the deviations in the geometric dimensions and metallurgical defects. Hardness, they can be normal, trverdye and increased hardness.
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