Why you can hear a train on the railway tracks from miles away

The video explains how to detect an approaching train by listening to the sound waves traveling through railway tracks. It discusses the nature of sound as a pressure wave and how it propagates faster in solids than in gases due to molecular density. The video also covers the concept of sound intensity in different dimensions, highlighting why sound on tracks remains detectable over long distances. It concludes with safety advice and a call to support the channel.

What factors contribute to the effectiveness of listening to railway tracks for detecting an approaching train?

Why is it dangerous to cross a bridge when a train is coming, despite the speed of sound?