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Track devices type: Simple track switches S 49E1-190-1:9 AF, S 49E1-300-1:9 AF, S 60E1-300-1:9 AF and track braces 49E1-300-1:9 AF, 60E1-300-1:9AF (D=4.75 and 5.00m), Ec 1435 mm and mounted on concrete sleepers with galvanized bolts”. Track devices are fixed track installations that serve to safely transfer rolling stock from one track to another. In operation, due to the dynamic loads applied by the circulating rolling stock, the running components and the support of the track devices wear out. When the wear of the track device subassemblies reaches the limits allowed by the current instructions and when defects appear on the special sleepers, it is necessary to replace the worn running components and defective sleepers with new ones. To extend the service life of the sleeper set, modern simple track devices are mounted on concrete sleepers, which considerably increases the service life of the track device. Quantity according to the specifications: Minimum framework agreement quantity (4 years) “Track devices mounted on concrete sleepers” = 32 pcs. Maximum framework agreement quantity (4 years) “Track devices mounted on concrete sleepers” = 768 pcs. Minimum subsequent contract quantity “Track devices mounted on concrete sleepers” = 8 pcs. Maximum subsequent contract quantity “Track devices mounted on concrete sleepers” = 192 pcs. Frequency of awarding subsequent contracts: maximum 2 (two)/year.