From: mrbrklyn@panix.com   
      
   John Levine  wrote:   
   > According to danny burstein  :   
   >>. Improvements so far include the replacement of 128 bridge spans that   
   >>connect tracks, column to column; the addition of 12,800 feet of new   
   >>aluminum third-rail; and the addition of 6,500 feet of signal cables,   
   >>25,000 feet of new running rail, and over 40,000 feet of new communication   
   >>cables.   
   >>      ======   
   >>rest:   
   >>https://www.amny.com/nyc-transit/park-avenue-viaduct-metro-north-10062025/   
   >>   
   >>   huh?  aluminium third-rail ??  Is that legit?  Thanks   
   >   
   > Sure.  Here's a company that makes them, aluminum with a steel cap.   
   >   
   > https://www.rail-fastener.com/the-third-rail.html   
   >   
   > Aluminum conducts much better than steel so I'd expect the power losses to   
   > be lower, and in new construction you could put the power feeds further   
   apart.   
   >   
   > It says "The conductivity of aluminum alloy is 3-4 times that of low carbon   
   steel."   
      
      
   Not Aluminum Oxide...   
      
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