Question

why are there gaps between sections of rails on the railway track

Answer 1

if the rail are filled end to end leaving no gap, then on expansion, the rails would bend. To avoid this, rails are joined by a fish plate, leaving some gap between the rails.

Answer 2

so that there is enough margin for track to expand and contract due to the temperature change .If that gap is not left then the tracks might have enormous stress in them while expanding due to heat
hope this answer help you
please mark as branlist