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Re: The Need for HEP and DPUs
Author: theconductor
Date: 07-03-2011 - 17:59

Marty Bernard Wrote:
-------------------------------------------------------
> The diesel in this case was for head-end power
> (electricity) for the train. Sure it's a
> reliability thing too. And in some cases (not the
> 4449 as I understand it) the steam engine may not
> be up to the task.
>
> DPUs (Distributed Power Units) balance the load.
> The first coupler on the first freight car without
> DPUs must take the force of the whole train.
> Couplers break. Radio controlled DPUs allow
> longer trains. The train on the bridge in my
> picture seems well over powered however, even for
> the Oregon Trunk. DPUs can also be mid-train.
> TRAINS magazine did an article on the concept
> including how DPUs help avoid derailments of long
> trains on curves.
>
> Hope this helps.
>
> Marty

To answer why use them for the "flatlands" it's for fuel savings. I believe UP has figured about 6% less fuel used on a dpu train vs. a non dpu train of equal weight/power. That is a LOT of money saved.

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Subject Written By Date/Time (PST)
  4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Marty Bernard 07-02-2011 - 22:20
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Marty Bernard 07-02-2011 - 22:24
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia P.Kepler 07-02-2011 - 23:00
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Marty Bernard 07-03-2011 - 08:02
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Dan 07-03-2011 - 08:48
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Will 07-03-2011 - 06:17
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Freericks 07-03-2011 - 06:31
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia BOB R 07-03-2011 - 11:46
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia K. Van Atta 07-03-2011 - 12:13
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Caboverbob 07-03-2011 - 16:22
  The Need for HEP and DPUs Marty Bernard 07-03-2011 - 17:51
  Re: The Need for HEP and DPUs theconductor 07-03-2011 - 17:59
  Re: The Need for HEP and DPUs Marty Bernard 07-03-2011 - 19:52
  Re: The Need for HEP and DPUs theconductor 07-03-2011 - 23:14
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Margaret (SP fan) 07-03-2011 - 18:11
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Ed Immel 07-03-2011 - 20:12
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia George Andrews 07-03-2011 - 20:59
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia Ed Immel 07-04-2011 - 09:51
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia crmeatball 07-04-2011 - 16:27
  Re: 4449 Arriving, Turning, and Departing Wishram Today From the Oregon Side of the Columbia BOB R 07-04-2011 - 17:59
  There is a glich in the website Marty Bernard 07-04-2011 - 14:36


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