Applied on the main tracks of underground railway lines with the speed of passenger trains on the straight track up to 100 km/hour, on the side track up to 40 km/hour. Design features: transfers: separate fastening; elastic bar terminals Skl; pads with flanges; made on a rigid (ballastless) base; switches:swivelling sharps with liner-and-lap root attachment; elastic U-shaped spring terminals; welded pads with cushions; crosses: prefabricated with rail whiskers and cast core of high-manganese steel with liner-and-lap end of rear outreach; counter-rail made of SP850 corner
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