| 摘要 |
A wagon retarder for installation on a railway track has a telescopic cylinder and piston device containing hydraulic fluid and compressed gas, said device being contracted by an approaching wheel and then being extended by the compressed gas as the wheel moves away. The cylinder slides in a fixed guide cylinder, and it slides on the piston which has a piston rod of smaller diameter extending through a sealing device into engagement with the base of the guide cylinder.
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