From: jishnu@nospam.verizon.net   
      
   On 2/10/2016 10:20 AM, Clark F Morris wrote:   
   > On Tue, 9 Feb 2016 11:49:35 -0500, Jishnu Mukerji   
      
   >> Amtrak is neither changing the voltage nor the frequency on NEC south.   
   >> They are adding 25Hz capacity. They don't foresee any problem with   
   >> operating at 160mph using 12.5kV 25Hz.   
   >   
   > From what I gathered from Harry Rappaport's (I hope I remembered the   
   > name correctly), the problem would come if they went to 60 cycles and   
   > stayed at 12.5 KV.  From postings here the problem with 25 cycles is   
   > the weight of the transformers and possibly other electrical   
   > equipment.  Since my expertise is computer programming, not electrical   
   > engineering I may have things mixed up.   
      
   I cannot figure out why this would make a huge difference. This is the   
   only place where I have seen this raised as a major issue. I find it   
   inconceivable that it would be impossible to transmit the same wattage   
   that can be sent over 12kV 25 Hz, on 12kV 60Hz. worst case it may take a   
   slightly heavier conductor. So I don't really take this too seriously,   
   sorry to say.   
      
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