| 摘要 |
Two spreadable hoods, run on rollers or rails in the outside longitudinal beams area of the wagon. The inner hood (1) has a spreader track which exposes the sealing surfaces (5) to the end wall (6). The outer hood (2) has a large spreader track permitting travel by the spread inner one. The hoods' lower part is tapered in a wedge shape, from inside (8) to exterior (9), (9). The end wall's outside shape (10) widens in a wedge-shape. At the roof, the hoods' half hoops have tracks for guide rollers and hoop extensions, and are movable between opening and closing positions, through guide edges. The hoods are divided, at the distance of half spread travel from the longitudinal centre.
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