From: jishnu@nospam.verizon.net   
      
   On 12/28/2015 4:38 PM, hancock4@bbs.cpcn.com wrote:   
   > On Monday, December 28, 2015 at 12:30:37 PM UTC-5, Stephen Sprunk wrote:   
      
   >> OTOH, what all is needed to do a conversion?  Remove the center bulb and   
   >> block the hole, change two outer lenses from amber to red, two from   
   >> amber to green, two from amber to lunar white, and then what?  That   
   >> seems simple (and cheap) enough to just all the rest at once.   
   >   
   >   
   > I believe there are modfications to relay controls, perhaps the   
   > wiring, not just the signal head.  For example, at one NEC   
   > location, I noticed that the hardware holding up a signal was   
   > badly corroded.  It appeared when they went to color they   
   > replaced all the hardware and put it an all new signal head.   
      
   This discussion as it applies to the NEC South is now of theoretical   
   interest only, since most of the hardware and all of the software for   
   the NEC signaling system has now been replaced. There is very little   
   original PRR stuff left (yes some still around, but getting replaced   
   rapidly). The signal placements have also been changed in many places to   
   make operations more efficient and to better match the new track layouts.   
      
   > FWIW, SEPTA has bid specs for a CBTC system. (500 pages, 6 meg,   
   > very detailed, but worth a look).   
   > http://www.septa.org/business/bid/100k/detail/MSHL-I&TC-%20FIN   
   L%20OPEN%20SPECS-_ISSUED%20FOR%20BID-1.pdf   
      
   That is for the Media Sharon Hill Line, not a main line railroad. All   
   commuter rail lines around Philly are using ACSES.   
      
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