| 摘要 |
<p>The complete renewal of a railway road track, i.e. clearing and screening the ballast, and substituting new ties and rails for the old ones, comprises a continuous sequence of operations forming repeating cycles consisting in removing the old track, clearing and screening the ballast, laying a new track with a single passage of a train comprising, in addition to the apparatus necessary for performing the operations, and to the cars necessary for transporting the rails, ties and hardware accessories, at least one track-laying and removing lift of trucks equipped with gantries and frame trucks.</p> |
