홈 > Term: rail track ballast
rail track ballast
Material placed around and between track ties and tamped under sides and ends of the ties to bring the track to proper grade by filling the space between the bottom of the ties and the graded roadbed.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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(V.I.P) 21084 포인트 - 100% positive feedback
(Milwaukee, United States)
