ews.eternal-september.org> faee6e03   
   XPost: uk.railway   
      
   On 28.12.17 15:49, Recliner wrote:   
   > hounslow3@yahoo.co.uk  wrote:   
   >> On 28.12.17 14:30, Anna Noyd-Dryver wrote:   
   >>> Phil Kane  wrote:   
   >>>> On Wed, 27 Dec 2017 13:12:58 -0000 (UTC), Anna Noyd-Dryver   
   >>>>  wrote:   
   >>>>   
   >>>>> After the old track and sleepers are removed, it appears from that   
   picture   
   >>>>> that the old ballast is being removed too, following which I would guess   
   >>>>> that better drainage will be installed, then there's usually a membrane   
   of   
   >>>>> some kind to keep the sub-soil out of the ballast, this will be followed   
   by   
   >>>>> the new ballast and finally the new sleepers and rails.   
   >>>>   
   >>>> Thank you very much for that explanation of the work to be done.  What   
   >>>> is not evident to me from the picture is whether the line was on   
   >>>> elevated structure, on the surface, or underground - the last two   
   >>>> would entail digging.  I am one-third of the way around the world and   
   >>>> don't remember those details from my one and only visit to London 50   
   >>>> years ago!   
   >>>>   
   >>>   
   >>> Even on an elevated structure, replacing the ballast will involve digging!   
   >>>   
   >>> This picture posted earlier in the thread   
   >>>    
   >>> clearly shows line in a cutting.   
   >>>   
   >>>   
   >>> Anna Noyd-Dryver   
   >>>   
   >>>   
   >> Elevated sections on the New York City Subway don't have ballast, AFAIK,   
   >> They just run on steel structures.   
   >   
   > Ah, I wondered about that. Are the rail ties just bolted to or rest on the   
   > bridge structure, or is there some sort of slab track?   
   >   
   They are bolted to the structure AIUI.   
      
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