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Re: [OM] Paul's PAW - two new train-related shots

Subject: Re: [OM] Paul's PAW - two new train-related shots
From: Paul Braun <pbraun42@xxxxxxxxx>
Date: Sun, 06 Apr 2014 13:29:07 -0500
On 4/6/14 13:03 : , Steve Troy wrote:
> ----- Original Message -----
> From: "Chris Barker" <ftog@xxxxxxxxxxxxxx>
>
> Thanks, Steve, but it doesn't describe the method of synchronising the power, 
> only centralising the control (which is neat, I grant you).
>
>
> The following might be more clear:
>
> There's a signal line that connects all the locomotives, called an "M.U. 
> jumper". M.U. stands for multiple-unit, and it goes back to the days of the 
> interurban streetcar.
>
>   So yes, if you have a big 6000 horsepower mainline diesel and also a tiny 
> 1000 horsepower switcher, they absolutely can M.U. and they can push the 
> train together for a total of 7000 horsepower. They don't have to be equal, 
> they just have to push in the same direction, lol!
>
>   There's some fairly tricky wiring in the M.U. cables to make sure the 
> locomotives push in the same direction. Modern diesel locomotives have I 
> believe 21-pin M.U. cables, which include several pins for sorting out 
> headlight controls.

What he said.  Much more detailed that my explanation.  Thanks, Steve!

-- 



Paul Braun
Certified Music Junkie
Valparaiso, IN


"It's such a fine line between stupid, and clever." - David St. Hubbins

"Music washes from the soul the dust of everyday life" - Harlan Howard

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