Why do railway tracks have crushed stones alongside them? - Alpha Rail
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Why are there crushed stones alongside rail tracks? - Quora
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Why Are There Crushed Stones Alongside Railroad Tracks?
Connecting Two Rails. Train Tracks Underlay, Rails and Crushed Stones Gap between Rails at Fishplate Stock Photo - Image of traffic, fishplate: 247593480
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Why Are There Stones Alongside Railway Tracks? » Science ABC
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