From: gl4317@yahoo.com   
      
   In article <200520142108382287%HAL@hal.invalid>, HAL    
   wrote:   
      
   > In article , Benjamin Kubelsky   
   >  wrote:   
   >   
   > > It isn't always that obvious. I was on a fan trip on a Budd built dome   
   > > car attached to a San Diegan about 10 years ago when the air was dumped   
   > > at about 90 mph near Camp Pendalton. Most of the passengers didn't   
   > > notice at first, but I happened to be speaking to one of the owners of   
   > > the car when it happened.   
   >   
   > I think we had this physics discussion before. The faster the train is   
   > going, if the air is dumped, the less it will be felt on the train. At   
   > 25 MPH it could knock someone over. At 90 MPH none will probably know   
   > but the crew.   
      
      
   It's also a matter of 100 cars worth of slack on a long freight train   
   vs. 14 to 18 or so cars of slack on a passenger train.   
      
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