Why are there always crushed stones near railway tracks ?
Correct answer: B. All of the these
- A. The stones did not allow vegetation to grow on railway tracks.
- B. All of the these
- C. To hold the wooden cross ties in place, which in turn hold the rails in place.
- D. To keeps water from reaching the track on a regular basis & softening the ground.
Explanation
Crushed stones, called railway ballast, drain water, suppress vegetation and hold the sleepers firmly in position. The sleepers then keep the rails aligned, so all three listed purposes apply.
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