Subject:
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Re: 10170 TTX Intermodal Double-Stack Car Preview
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Newsgroups:
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lugnet.trains
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Date:
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Sun, 8 May 2005 08:54:24 GMT
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Viewed:
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8343 times
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> In lugnet.trains, Larry Pieniazek wrote:
> > Kevin Salm wrote:
>
> > It has always been my understanding that the FIRST reason for shared
> > trucks is to reduce Rolling Resistance. Fewer wheels means less
> > rolling resistance. But, I could be wrong on this.
>
> I think that certainly helps, but I'd be interested in your sources. (snip)
As far as I have always understood it, the rolling resistance is practically the
same regardless of the # of wheels...with the exception that very lightweight
trains (such as empty container cars) have a higher drag than per lb than
heavyweight ones...the figure I have seen is 2 lb TE/100 lb load, to 8 MPH.
(above that, HP plays more than TE...you have to do the math to see it...)
I've never conducted trials to prove it...the only real experiment I can think
of that I have seen was the OMLET riding car that was full of lead...it was a
pig to move around, but the bearings in it were not doing a good job at all.
James Powell
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