Why Railway Much Gravel?

     Almost along the railroad tracks are usually located in the gravel bottom, the right and left side rail. Why deliberately placed and what does it do?

1. Function gravel on railway ballast is as cushioning. With the gravel layer is able to keep up with the rails stable. So the trains running on it can be run well. 
2. The gravel also serves to absorb vibration (shock absorber) which occurs when a train passing. So the shock that occurs when a train passes can be reduced. And railways were not easily damaged and can be used for a long time.
3. The next function is to hold and facilitate the flow of water in the rain. This function serves to prevent soil erosion or erosion of soil around the train tracks.
4. And lastly, gravel also serves to inhibit the growth of grass around the rails. Growing grass around the rail can be directly or indirectly lead to scarify the soil underneath. This of course can be dangerous because if the ground under the tracks unstable it will be harmful to a train journey. 

     Indeed, there are certain positions do not need gravel, such as railroad tracks located on the bridge or highway. This happens because all of the functions of the gravel had been taken over its function by other mechanisms. The bridge has been designed in such a way that it can withstand vibrations produced will happen when the train passed.

     Thus even with a rail located on the highway, paved roads have replaced the role of fine gravel. So that in such places, no longer needed to put gravel under the train tracks.

Written By : Arbha ~ Public-DYK

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