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| Q. |
forms the trackbed upon which railroad ties (sleepers) are laid. |
| A. | track ballast |
| B. | concrete ballast |
| C. | rail ballast |
| D. | wooden ballast |
| Answer» A. track ballast | |
| Explanation: it is packed between, below, and around the ties. it is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure. this | |
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