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Tram switches are manufactured using grooved rails Ri60 /60R1/ and NT1. The switches have block dog drivers, produced using special wear-resistant steel, which secures the smooth transition of the wheel flanges – for prevention of impacts and any follow-up noise. Manual turning mechanisms for switches are manufactured as well. Special tram switches, according to assignment and technical documents of the client, are also manufactured. The manufactured switches have either spring or elbow bolts. The tram grid of the city of Sofia uses more than 100 pcs. of new and various types of switches.