| 摘要 |
A method and apparatus for loading and unloading a railroad gondola car having spaced apart, parallel side walls with upper surfaces, the apparatus including a hydraulic excavator having a boom structure and material engaging device mounted on two tracks, the two tracks being movable inwardly and outwardly from the base of the hydraulic excavator to vary the distance between the tracks, each of the tracks having a lip connected thereto which extends downwardly adjacent to the upper surface of the parallel side walls of a railroad gondola car to prevent the hydraulic excavator from falling off the gondola car when the two tracks are resting on the side walls of the gondola car.
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