On the Talgo trains operated by Amtrak the passenger cars are much lower in   
   height than the locomotives. The trains have fin-like structures adjacent to   
   the locomotives to give a gradual change in roof height over a distance of   
   about a car-length. Is    
   there a measurable reduction on aerodynamic from this feature or is it more of   
   a styling thing?   
      
   I have seen pictures of Spanish Talgo trains where special locomotives the   
   same height as the Talgo cars were used. Is there any advantage in stability   
   on curves or in aerodynamic drag from this? If so, has Amtrak ever considered   
   getting such locomotives?   
       
      
   Thank you in advance for any replies,   
      
   Peter Wezeman   
   anti-social Darwinist   
      
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