S E J means……………
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A.
Switch Expansion Joint
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B.
Switch Extension Joint
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C.
Simple Extended Joint
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D.
None of the above.
Correct Answer:
A. Switch Expansion Joint
Explanation:
SEJ stands for Switch Expansion Joint, which is a critical component in railway tracks designed to accommodate the longitudinal expansion and contraction of rails caused by temperature fluctuations. It is typically installed at the ends of long welded rails (LWR) or near bridges to manage the movement between different sections of the track, ensuring structural stability and preventing rail buckling or fractures. By providing a controlled gap and sliding mechanism, the SEJ maintains a continuous running surface for the train wheels while allowing the steel to expand safely.
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