Why is there a space between the steel rails?

Before the advent of high-speed rail, we could always hear the sound of "thud thud thud" when taking the train. I believe this is an unforgettable experience and memory for many people. Today, when we take the train again, we will find that the rhythmic "thud" sound between the wheels and the rails is hard to hear again.

Why is there such a sound?

Some people say that this change occurred because there was a gap at the place where the rails joined, but now there is no gap between the rails, so there is no noise.  but is it really the case?  Of course, it must be said that the above statement is true!  On the former railway, close to the rail, careful observation will find that every 10 meters, there will be a little gap between the two pieces of rail. steel rail China manufacturer

Why do you want to leave some space between the rails?

Originally, this was done to solve the problem of thermal expansion and cold contraction of rail.  If there is no such gap, the steel rails will be squeezed, twisted and arched by the heat, thus deforming the whole railway.  In summer, when the weather is hot, the length of the steel rail increases, and the steel rail without reserved gaps can only bulge upward, which is obviously unfavorable to driving safety. In order to avoid this phenomenon, gaps must be reserved between the steel rails. steel rail China manufacturer

How much gap should be left between rails?

In order to drive safely, the rail gap should not exceed 11mm in general. According to the experimental measurement, the rail will expand and contract by 0 .011mm for every meter when the rail temperature changes by 1?.  In China, the temperature difference between winter and summer can usually be about 80? on the railway lines in the south and the north. According to the solid line expansion relation, the length of each rail section is 12.5m. steel rail China manufacturer

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