On Friday, April 10, 2015 at 9:54:00 AM UTC-4, Clark F Morris wrote:   
      
   > Given that SEPTA needs to upgrade to high level platforms for ADA and   
   > performance reasons, this could make a lot of sense.   
      
   SEPTA does NOT need to upgrade to high level platforms for ADA.  A small mini   
   platform is all that is needed, which is much cheaper to build.   
      
   High level would not significantly improve SEPTA times as the passenger count   
   at an individual station isn't that high.  Further, high level paltforms get   
   out of alignment (visit Princeton Jct) and cease being an improvement.   
      
      
   > Differing speed   
   > bands and maintenance needs (50 mph heavy haul versus 80 - 90 mph   
   > every 15 minute or half hourly passenger service) can make separate   
   > lines the best answer.  Switches are expensive.   
      
   SEPTA trains run at the same speed as freights--60 mph.  Double track easily   
   handles 20 minute rush hour headways mixed with freight.   
      
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