The 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, it’s important to understand that you can’t 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. #science #animation #trackballast #track #ballast Intro - 0:00 What is track ballast? - 0:37 7 reasons behind why there are stones on railway tracks - 2:03 Maintenance of track ballast - 4:47 References https://www.nap.edu/read/22800/chapter/6 http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.432.4148&rep=rep1&type=pdf https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1078&context=ce_etds https://railtec.illinois.edu/wp/wp-content/uploads/pdf-archive/Qian-et-al-2011_ISEV.pdf Original Article Link: https://www.scienceabc.com/pure-sciences/why-are-there-stones-train-ballast-alongside-railway-tracks.html If you wish to buy/license this video, please write to us at admin@scienceabc.com. Voice Over Artist: John Staughton ( https://www.fiverr.com/jswildwood ) SUBSCRIBE to get more such science videos! https://www.youtube.com/channel/UCcN3IuIAR6Fn74FWMQf6lFA Follow us on Twitter! https://twitter.com/abc_science Follow us on Facebook! https://facebook.com/sciabc Follow our Website! https://www.scienceabc.com/