From: finfer@optonline.net   
      
   On 2/8/2016 12:24 AM, hancock4@bbs.cpcn.com wrote:   
   > On Thursday, December 24, 2015 at 10:09:51 AM UTC-5, Jishnu Mukerji wrote:   
   >   
   >> Operationally NEC is primarily cab signaled system with ACSES overlay.   
   >> They are progressively removing trackside block signals, and just   
   >> keeping the trackside Home signals. Specially in high density traffic   
   >> areas like between Newark and New York, the blocks are now so short that   
   >> having trackside signals would make it very very confusing.   
   >   
   > FWIW, the block signals at the Levittown, PA, station are still in place   
   > and in use.   
   >   
   > I haven't been to Princeton Jct in a while, so I don't know if the   
   > block signals there are still in place.   
   >   
   > SEPTA has removed some block signals from the Chestnut Hill West (ex PRR)   
   > line.  Whether they've been merely moved to a new location or permanently   
   > pulled I don't know.   
   >   
   > CSX has added some block signals to its new dedicated track on the   
   > West Trenton line.   
   >   
   > Has anyone been to the LIRR lately?  Does that still have PRR-style   
   > signals?   
   >   
   > FWIW, the Nov-Dec 2015 DVARP bulletin says the following about Positive   
   > Train Control:  "while increasing the margin of safety, PTC takes away   
   > some margin for on-time performance. Like other automated safety   
   > technology, it isn't as smart as an experienced locomotive engineer,   
   > and it sets train braking points well ahead of what's necessary under   
   > normal conditions. So trains approach junctions and other speed   
   > restricted areas slower than they used to."  (page 8).   
   >   
   >   
   > Another cause of SEPTA's slipping on-time performance   
      
   Amtrak is converting the corridor between County and Ham to rule 562.   
   The automatic block signals at Princeton Jct. are out of service.  I   
   have not been there recently to see if they have been removed.   
      
      
    From what I understand, the LIRR intends to change to color light   
   signals.  I hardly ever go out there, but I have noticed color light   
   signals on the main line east of Woodside.   
      
   As for PTC, there's no reason for it to degrade on time performance.   
   The schedules will have to be lengthened.  That's something that NJ   
   Transit excels at.   
      
   --   
   Michael Finfer   
   Bridgewater, NJ   
      
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