| 摘要 |
A ballast tamping unit has a vibratory and reciprocable tamping tool holder pivotal in the direction of the track about a fulcrum intermediate the tamping tool holder ends. Two side-by-side tamping picks are mounted on the lower tamping tool holder end for immersion in the ballast upon vertical adjustment of the tamping tool carrier, a first one of the tamping picks being closer to the rail than the other tamping pick and the two tamping picks being mounted at least on one side of the rail for independent pivoting in a plane extending perpendicularly to the direction of reciprocation between an operating position wherein the picks extend substantially vertically for immersion in the ballast and an inoperative position wherein the picks extend substantially horizontally above the track, and separate power drives pivot the two tamping picks independently of each other.
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