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\nWhy Are There Stones Along Railway Tracks?\n

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\n\nPublisher:\n\nScience ABC\n\n\n
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\nThe crushed stones that line railroad tracks are collectively called track ballast. More specifically, the track ballast constitutes the trackbed upon which sleepers or railroad ties are laid. As you may have seen, these stones are...\nThe crushed stones that line railroad tracks are collectively called track ballast. More specifically, the track ballast constitutes the trackbed upon which sleepers or railroad ties are laid. As you may have seen, these stones are packed below, between and around the railroad ties. The thickness of the track ballast usually ranges between 25-30 cm, and varies depending on certain conditions pertaining to the geographical location of the railway track. Track ballast usually consists of crushed rocks or stone, but in some cases, less suitable alternatives, like burnt clay, are also used. However, its important to understand that you cant just throw a bunch of rocks on a railroad and be done with it. As mentioned, the stones in the track ballast have a characteristic shape, size and texture. Their surface is not smooth and their edges are jagged, and for good reason. These rocks interlock with each other and therefore stay in place. If you replace them with circular or smooth rocks, they would slide over each other and compromise the strength of the track ballast. As you might imagine, this can have catastrophic results.\n
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Resource Details

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Educator Rating
Not yet Rated
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Media Length
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5:33
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Grade
Pre-K - Higher Ed
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Subjects
Science
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Media Type
Instructional Videos
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Source:
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\nScienceABC\n\n
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Date
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2020
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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trains, pressure, texture, nature, vegetation, water, grass
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track ballast, railroad track ballast, railway track ballast, train track ballast, model railroad, train, train track, track stones, railway track, metallic parts, railroad ties, moving train, crushed stones, track, ballast, tracks, important, stones, ride, sleepers, jagged, place, compromise, strength, forces, number, stress, comfort, accumulate
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