Question

The metal used for connection of railway tracks after a particular distance ( zn,al,k,re)
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Answer 1

Answer:

Train rails are joined together via a seriously awesome process called exothermic welding, which basically involves lighting off a chemical called Thermite and sending molten iron into a sand mould.

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Answer 2

Answer:

The gap is left between the rails to provide a space for the iron metal to expand and contract during the summer and winter season due to the change in the temperatures. If the gap is not left in between then the rails will bend more and cause derailing of the trains.

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