Q. Bank For Civil Engineer LDCE Exam - Define the following.

Q. Define the following. 

Ans :- 

1. Destressing :- This is the operation undertaken with or without rail tensor to secure stress free conditions in the LWR/CWR at the desired/specified rail temp. 

2.L W R :- LWR is a welded rail, the central part of which does not undergo any longitudinal movement due to temp. variations. A length greater than 250 metres on B.G. and 500 metres on M.G will normally function as LWR.

3.Destressing temp.:- This is the average rail temp. during the period of fastening the rails to the sleepers after distressing LWR without use of rail tensor.

4.Breathing Length:- This is that length at each end of LWR/CWR which is subjected to expansion/contraction on account of temp. variations.