From: HAL@hal.invalid   
      
   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.   
      
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