In a railway track, two rails are joined end to end with a gap in between them b

Question

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

Options:

A . Steel can be saved

B . Accidents due to contraction in winter can be avoided

C . Air-gaps are necessary for bearing the weight of running train

D . Accidents due to expansion in summer can be avoided

Answer: Option D

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