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In a railway track, two rails are joined end to end with a gap tin between them because?

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In a railway track, two rails are joined end to end with a gap tin between them because? Answer: Accidents due to expansion in summer can be avoided

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.