| 摘要 |
Railway sleeper comprising a main structure (2) having a main direction of development, an upper surface (3) able to be associated to a railway track, and a lower base (4) able to be set down onto a railway ballast. The sleeper (1) further comprises at least a compensating element (5) associated to the main structure (2) in correspondence with the lower base (4), defining with the lower base (4) a lower bearing surface (6) of the sleeper (1), and movable relative to said lower base (4) at least between two operative positions, to each of which corresponds a different conformation of said lower bearing surface (6) to compensate for collapses and settling of said ballast. <IMAGE>
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