Railway vs Metro tracks key differences

When travelling by train, you may have noticed stones lying between and around the railway tracks. But have you ever wondered why metro train tracks usually do not have these stones?

The main reason is that traditional railway tracks and metro tracks are built differently. Both systems need strong support, but they use different methods to keep the tracks stable and safe.

Why do Railway tracks have stones?

The stones placed around railway tracks are called track ballast. They play an important role in keeping trains running safely. These stones help spread the heavy weight of a train across the ground. They also keep the tracks in place and reduce unwanted movement when a train passes.

Another important benefit is drainage. The gaps between the stones allow rainwater to flow away instead of collecting around the tracks.

Why do metro tracks usually have no stones?

Most metro tracks use a strong concrete base instead of loose stones. This type of track is known as a ballastless track. The concrete base holds the rails firmly in place and helps maintain their correct position.

It is especially useful for metro systems that run through underground tunnels or on elevated bridges.

Another advantage is that concrete tracks generally require less maintenance related to loose stones. This makes them a practical choice for many metro systems.

Do all metro tracks have no stones?

No, not all metro tracks are built without stones. Some metro systems use traditional tracks with ballast, particularly in train depots and certain maintenance areas.

The choice depends on several factors including the location of the track construction costs and future maintenance needs.

In short traditional railway tracks often use stones for support and drainage while many metro tracks rely on a solid concrete base to keep the rails stable and reduce maintenance.