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Where should I gap my reverse loop?

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  • Member since
    September 2004
  • From: Dearborn Station
  • 24,281 posts
Posted by richhotrain on Friday, January 8, 2016 9:59 AM

carl425

 

 
richhotrain

You really only need one reversing section. The rest of the layout would be the non-reversing section.  No need for a second reversing section. 

 

 

Oh, I think I get it now.  For example you could put the gaps at each end of the two 180° curves, make the curves "the rest of the layout" and make the entire middle the reversing section.

 

Exactly.  You could isolate the crossover as the reversing section.....or the left loop, or the right loop, or the top, or the bottom. It all depends upon where you decide to place the gaps and what location you prefer for the reversing section.

Rich

Alton Junction

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  • From: Richmond, VA
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Posted by carl425 on Friday, January 8, 2016 9:31 AM

richhotrain

You really only need one reversing section. The rest of the layout would be the non-reversing section.  No need for a second reversing section. 

Oh, I think I get it now.  For example you could put the gaps at each end of the two 180° curves, make the curves "the rest of the layout" and make the entire middle the reversing section.

I have the right to remain silent.  By posting here I have given up that right and accept that anything I say can and will be used as evidence to critique me.

  • Member since
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  • From: Dearborn Station
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Posted by richhotrain on Friday, January 8, 2016 8:20 AM

You really only need one reversing section. The rest of the layout would be the non-reversing section.  No need for a second reversing section.

Rich

Alton Junction

  • Member since
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  • From: Richmond, VA
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Posted by carl425 on Friday, January 8, 2016 8:16 AM

I think the easiest way to handle this would be to create 2 reversing loops.  Gaps marked in red.

I have the right to remain silent.  By posting here I have given up that right and accept that anything I say can and will be used as evidence to critique me.

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Posted by richhotrain on Friday, January 8, 2016 4:43 AM

xdford

Check out the link I have here to an article I  wrote a while ago. The track plan is not dissimilar

http://yourmodelrailway.net/view_topic.php?id=10671&forum_id=6&highlight=sunil#p203690

Yeah, that could work, as Greg and I mentioned in our earlier replies. But, since the crossover section of track is only long enough to accommodate a 3-locomotive consist, it may not be sufficient to hold the OP's longest train, assuming metal wheels on the rolling stock, and a dead short may occur.

Rich

Alton Junction

  • Member since
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  • From: AU
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Posted by xdford on Friday, January 8, 2016 2:46 AM

Check out the link I have here to an article I  wrote a while ago. The track plan is not dissimilar

http://yourmodelrailway.net/view_topic.php?id=10671&forum_id=6&highlight=sunil#p203690

Hope this helps ... if you want a drawing tailored to you, PM me with your email address!

Cheers from Australia

Trevor

  • Member since
    August 2013
  • 95 posts
Posted by CajonTim on Friday, January 8, 2016 1:30 AM

I'm not sure if it matters with DCC, but I would suggest that wherever you choose to have your reversing loop, your staging yard should enter the main line outside that reversing loop.  It does matter with a DC wired layout.  (it can be overcome but it complicates the issue)

Tim

  • Member since
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  • From: Dearborn Station
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Posted by richhotrain on Thursday, January 7, 2016 8:19 AM

There are several ways to accomplish your objective depending upon where you want the reversing section and how you are willing to wire your layout.

You could treat the right side of the layout as the reversing section or, alternatively, you could treat the left side of the layout as the reversing section.

If you follow a conventional wiring pattern with the outside rail all around the layout as one polarity and the inside rail all around the layout as the other polarity, the point of reverse polarity will be where the crossover turnouts connect.  The rails need to be gapped at that point and, in addition, two more sets of gaps will be needed elsewhere to completely isolate the reversing section. It will be up to you to pick the right side or left side of the layout for that purpose.

Another way to deal with the reverse polarity issue would be to wire the crossover and adjoining tracks with matching polarities and then isolate the top or bottom of the layout as the reversing section. This arrangement would require two sets of gaps to isolate the reversing section.

Rich

Alton Junction

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  • From: lavale, md
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Posted by gregc on Wednesday, January 6, 2016 8:26 PM

in general, you would like the reversing section to be longer than your longest train so that when a train has completely entered the reversing section the polarity can be aligned at the exit end without worrying about any metal wheels causing a short at the entrance end.

in your case both rails at each end (4) of the section identified as "long enought for a 3-locomotive consist" should be gapped near the turnouts.

greg - Philadelphia & Reading / Reading

  • Member since
    January 2016
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Where should I gap my reverse loop?
Posted by WW Valley Modeler on Tuesday, January 5, 2016 2:45 PM

Hi everybody,

I am building my first large layout (12' x20' with a 12-foot staging extension.  I have planned a reverse loop created by a cross-over from westbound to eastbound track (see the attached simplified track diagram).  I'm not sure where to gap the rails for the reverse loop.  I will be using DCC and an auto-reverse module.  Any suggestions will be appreciated.

Simplified Track DiagramThanks!

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