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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