In railway tracks, a small gap is left between the rails ?

ریلوے کی پٹریوں میں، ریلوں کے درمیان ایک چھوٹا سا خلا رہ جاتا ہے؟

To permit the shrinkage of metal

To save the cost of metal

To allow for the expansion during heat

None of them

The reason is that the rails expand in summer

. The gap is provided to allow for this expansion.

If no gap is left the expansion in summer will cause the rails to bend sideways

This may result in train accidents.