Hey pls help me fast and fast answerring pls give short answerwhy are gaps are left in between rauls while laying railway tracks

Hey pls help me fast and fast answerring pls give short answerwhy are

1.	Hey pls help me fast and fast answerring pls give short answerwhy are gaps are left in between rauls while laying railway tracks
Answer» So that there is enough MARGIN for thetracks to EXPAND and contract due to the temperature changes. If that gap is not LEFT then the tracks might have ENORMOUS stress in them whileexpanding due to heat. I hipe it's hekp U :-)