Re: Railway lines-not just the UK
Posted by Alan Harding on July 21, 2022, 14:54:28, in reply to "Re: Railway lines-not just the UK"
A couple of observational points: |
Welded steel rails were introduced because they allowed trains to run faster and quietly. However, there are some clever Engineering aspects involved in the laying of the lines - They are stretched during laying, rather like pulling on an elastic band, when the desired amount of stretch is reached the rail is held in place by the clamps on the sleepers. The trick here is that the rail can slide through the clamps(hot days) and back through the clamps (cold days). Too hot and the rail grows beyond its designed allowance for stretch, hence buckling. Too cold and the rail shrinks and snaps at the weld point. A balance has to be struck between the two. Problem today is that we are in a place where 'Climate change' is kicking in!! something not really considered when the rail system was renewed to continuous railing!! Recent temperatures have exceeded normal body blood temperatures. A moot point here, who designed our bodies such that they cannot cope with climate change?