Correct Answer - Option 4 : Due to contraction of rail tracks in winter
Explanation:
Buckling of rail: A rail track is getting distorted, particularly in hot weather when the compressive forces in the track exceed the lateral or longitudinal resistance of the track.
The buckling of the track is a matter of grave concern as it may lead to derailments and even serious accidents.
Cause of buckling of rail: A railways track can be buckle due to many reasons which are given below:
- Inadequate resistance to track due to deficiencies in the ballast
- Excessive creep, jammed joints, sunken portions in a welded track
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Due to excess tightening of bolts of the fishplates
- Due to welded rails on weak tracks
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Insufficient expansion gaps at rail joints
- Laying, destressing, maintaining or raising the track outside the specified rail temperature range, especially in hot weather
Note:
Due to the contraction of rail tracks in winter, there is no possibility of buckling of railway tracks. Hence this is not the reason for the buckling of rail.
