¿Por qué las vías del tren están llenas de piedras?
Why are train tracks full of stones? It's not neglect or dirt: those stones have a name, a purpose, and an engineering system behind them that has been working for over 150 years. In this video, I explain what ballast is, why loose stones work better than concrete, and why not just any stone will do. Everything explained simply, with everyday examples. If you've ever crossed train tracks and never wondered what was under the rails, after this video you won't be able to stop watching. Everyday engineering, explained simply. 🔔 Subscribe for more stories about the world around us! 📌 Chapters: 00:00 - Introduction 00:47 - The Problem Nobody Sees 01:59 - Why Loose Stones and Not Concrete 03:27 - Why Not Just Any Stone Will Do #trains #engineering #funfacts
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