From: Benjamin.Kubelsky@verizon.net

On 5/20/2014 6:08 PM, 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.
>

Thanks Hal, that's what I thought. Actually, it's the same in an
automobile. Anyone remember getting into a new (to you) car with very
efficient power brakes? A slight tap at 10 mph might put you through the
windshield save for the seat belt. The same tap or even a good stomp
won't do the same at 70.

Heck, I've been on streetcars in San Francisco that threw everyone
asunder on braking from 30 mph or so.

What got me on the Silver Lariat was that the transition to braking was
so subtle that it went unnoticed by most passengers. Only those with a
lot of experience knew what happened immediately.

Regards,

DAve

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