| 摘要 |
A ground-mounted elevatable cam track arrangement for operating railroad car mounted hopper discharge door operating linkage, which arrangement includes a movable door-operating linkage cam-supporting structure, and fixed ground-mounted cam support structure having guide means guiding the upward and downward travel of the movable cam support structure and having hydraulic means raising or lowering the movable cam support structure from the elevated in-use position at the railroad trestle to the lowered out-of-use position at the railroad trestle, and adjusting means for limiting the maximum elevation of the movable cam structure.
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