From: lfsheldon@gmail.com   
      
   On 9/4/2016 21:39, 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 was thinking only of the traction motors.   
   >   
   > 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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