From: ahk@chinet.com   
      
   Robert Heller  wrote:   
   >At Sun, 4 Sep 2016 21:02:48 -0500 Larry Sheldon  wrote:   
   >>On 9/4/2016 15:09, Adam H. Kerman wrote:   
      
   >>>Even in interurban days, we've read that CNS&M RR, which did operate at   
   >>>grade through suburban territory, lost plenty of motors during winters   
   >>>with heavy snowfall.   
      
   >>>Motors need to be cooled. They need air intake. They need to be in a place   
   >>>under the railcar where they can provide traction. It's just the nature.   
      
   >>Don't diesel engines have the same problem?   
      
   >Actually no.  The air intake (for the prime mover) is near the top, *except*   
   >for "Tunnel Motors" -- "Tunnel Motors" are diesel engines specificly designed   
   >for long and poorly ventelated tunnels.  "Normal" engines would such diesel   
   >exhaust into the air intake and stall.  Opps.   
      
   I read that the air intake for streetcar motors in northern cities was near   
   the top to avoid sucking up snow.   
      
   >I think a diesel loco might have more under carriage clearance (larger wheels)   
   >AND are equiped with snow plows (so there is going to be less snow under the   
   >train). This probably means that they would not have the same traction motor   
   >issues as would a EMU (powered) transit car (which has no plow, smaller   
   >wheels, less ground clearance).   
      
   >>>Anyway, CTA spec'ed how the motors were ventilated. It wasn't the   
   >>>manufacturer's problem.   
      
   >>I think the manufacturer has a moral responsibility to say "We are NOT   
   >>going to put our name on a defective design like that."   
      
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