MCQ- LWR

A length of welded rail greater than 250 m on BG will normally function as LWR

CWR:Continuous Welded Rail is an LWR, Distressing of which may br required to be carried out in parts. Maximum length of CWR under Indian Railways condition shall normally be resticted to one block section.

SWR: Short Welded Rail is a welded rail, which contracts and expands throughout its length

  • Breathing Length is that length at each end of LWR/CWR,which is subjected to expantional/contraction on account of temperature variation
  • Buffer Rail are a set of rails provided in liue of SEJ at the ends of LWR/CWR to allow expansion/contraction of adjoining breathing lengths due to temperature variation

SEJ: Switch Expansion Jointis an expansion joint installed at each end of LWR/CWR to permit expansion/contraction of the adjoining breathing lengths due to temperature variation.

  • Initial gaps at SEJ to be provided at td- 40 mm
  • Maintain gaps at SEJ- 40 to 120 mm

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