Why Are There Stones on Railway Tracks but Not on Metro Tracks? The Science Behind This Everyday Mystery
Have you ever looked at a railway track and wondered why it is covered with thousands of small stones, while many modern metro tracks appear to sit directly on concrete? At first glance, the difference may seem unimportant. However, these two track systems are designed differently to meet specific engineering requirements. The stones found beneath traditional railway tracks are not ordinary decorative rocks. They are an essential part of railway engineering, helping trains travel safely and keeping the tracks stable under enormous loads. Meanwhile, many metro systems use specially designed concrete foundations that provide similar support without the need for loose stones. So, why do traditional railway tracks need stones, and why do many metro tracks not? Let's understand the science behind this fascinating difference. 1. What Are the Stones Under Railway Tracks? The stones spread beneath and around railway tracks are known as track ballast . They are an important component of con...