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dcc better for running train up steep grades

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  • Member since
    April 2008
  • 6 posts
dcc better for running train up steep grades
Posted by trainguyu2 on Saturday, February 21, 2009 4:02 PM

My layout has a few steep grades (25 degrees ) and locomotives strain to climb grade.Will DCC help  give more power to locomotives so that it will maintain speed.

  • Member since
    July 2006
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Posted by locoi1sa on Saturday, February 21, 2009 4:56 PM

 For a short answer, no. And yes. With DCC you could have helpers pushing on the rear and cut off when not needed.

     Pete

 I pray every day I break even, Cause I can really use the money!

 I started with nothing and still have most of it left!

  • Member since
    July 2003
  • From: Sierra Vista, Arizona
  • 13,757 posts
Posted by cacole on Saturday, February 21, 2009 6:52 PM

 No, DCC will not give your locomotive more power, but it is much easier to double or triple head engines and/or use mid-train or rear end helpers using DCC.

  • Member since
    February 2008
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Posted by maxman on Sunday, February 22, 2009 11:08 AM

trainguyu2
My layout has a few steep grades (25 degrees ) and locomotives strain to climb grade.

Are your grades really 25 degree?  The tangent value for a 25 degree angle is about 0.466.  The tangent of an angle is defined as the side opposite the angle divided by the side adjacent to the angle or rise divided by the run.  If we assume that the run is 100 inches and solve for the rise, then the equation is rise divided by 100 inches equals 0.466.  The rise works out to be 46. This is also the slope.

Seems pretty steep to me.  Are you modelling a cog railway?

  • Member since
    October 2004
  • From: Colorful Colorado
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Posted by Texas Zepher on Monday, February 23, 2009 5:34 PM

trainguyu2
My layout has a few steep grades (25 degrees ) and locomotives strain to climb grade.  Will DCC help  give more power to locomotives so that it will maintain speed.

It would be expected when a train goes up a grade that it would require more throttle to maintain speed.  Are you not giving them more power when they are in the grade?  

Another note is that most real trains don't maintain speed going up grade, they slow down.  On the joint line out of Denver the trains will rocket along at 55-70mph until they hit the monument grade (about 2.2%) where they slow to 20-40mph.

How much a DC locomotive slows down, depends on the quality of the DC throttle.  Really cheap ones will slow down much more than a really good electronic one.   On the other hand there are DCC decoders that have a built in circuit called EMF.  It is the purpose of this circuit to maintain motor speed (hence locomotive speed) and do what you are asking. 

 

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