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Use of fish plate in railway tracks.

Hello all,
From our childhood days we have witnessed that there is a gap after certain intervals on railway tracks.Moreover the two tracks having gap is bolted with a plate.This plate is called fish plate.Now there must be two questions arising in your mind
1st-What is the need of gap?
2nd-What is the use of fish plate?
Let's take the 1st question.The need of gap is to compensate the expansion caused due to increase in temperature which would ultimately lead to cracking and we cannot afford it.From the equation of thermal expansion length is directly proportional to temperature.
Now come to second question about fish plate.See if we don't join the two tracks with the help of fish plates with adjustable bolts then misalignment will take place while train runs over it.To maintain the alignment in horizontal and vertical directions,the bolts are implemented and are kept bit loose for managing the alignment in horizontal and vertical directions.For more information Google it.
Thanks...

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