FIELD: railway construction industry. SUBSTANCE: this relates to upper structure of railway track. Steel sleeper 1 is of box-type cross-section and has longitudinal slot 3 in its upper flange 2. Lower surface of sleeper in its cross-section is formed by two arched vaults 6 which are symmetrically located at both sides relative to longitudinal slot 3. EFFECT: higher efficiency. 1 dwg
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