Re: Tank cars

bladeslinger@[EMAIL PROTECTED]
 wrote:
> On Thu, 19 Jun 2008 23:06:18 +1000, "Bill Whale"
> <wwhale@[EMAIL PROTECTED]
> wrote:
> 
>> And the next question is, why do modern tank cars have no domes?
>>
>  
> They do have domes, they're just not as big as on the older cars.  All
> the dome was was a cover for the valves.  But a lot of cars now do
> have a small cover over the valves.  Depends on the car

Not right!
The dome was for the expansion of the product. It may also have covered 
various valves, etc.
Today the control the loading to provide for the expansion, yesterday 
the filled the shell of the tank andthe dome took care of the expansion.

Howard Garner