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DCC double main line junction -HO SCALE

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  • Member since
    September, 2008
  • 159 posts
DCC double main line junction -HO SCALE
Posted by NILE on Sunday, July 16, 2017 3:43 PM

I am designing a new layout and it may include a dogbone double mainline that comes back and crosses to make a junction.  If I do that the polarity of the rails would be opposite.   Which for the crossing would be ok, but if I want a connector track it would create a polarity problem.  Would an auto reverser fix that and if so where would I put it?   I read that the piece of track that uses that auto reverser needs to be long enough for a whole train, so that would be longer than a connector track.  Also, I would like the junction to be in the middle of the layout so the "loop" would be pretty big, maybe 10-12 ft long.  Is that to much track to be connected to the reverser?   

Thoughts?

  • Member since
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Posted by BigDaddy on Sunday, July 16, 2017 5:46 PM

I readily admit I have a form of dyslexia and you lost me with the connector track.

We know there is a dogbone, and crossing, a connector track? and all this happens in the middle of the layout.  Someone knows exactly what you mean and the next 10 of us have 10 different visions of your track plan.  A pic is worth a thousand Q&A's to your post.

If this ends up in a reversing loop then you need an auto reverser. The auto reverser could power a sub-bus that could supply feeders to your 12' of track.

This shows the auto reverser wiring for a crossing  http://www.dccwiki.com/Wiring_Crossings#Live_Frog_Diamond_Crossing

Henry

COB Potomac & Northern

By the Chesapeake Bay

  • Member since
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  • From: Reading, PA
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Posted by rrinker on Sunday, July 16, 2017 7:12 PM

 Probably the easiest way to handle a dogbone layout is to make the end loops the reverse sections. Then you can have an many crossovers between the two mains as you want without worrying about it.

                              --Randy

 


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

  • Member since
    September, 2004
  • From: Dearborn Station
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Posted by richhotrain on Monday, July 17, 2017 5:14 AM

NILE

I read that the piece of track that uses that auto reverser needs to be long enough for a whole train, so that would be longer than a connector track.  Also, I would like the junction to be in the middle of the layout so the "loop" would be pretty big, maybe 10-12 ft long.  Is that to much track to be connected to the reverser?   

A 10-12 foot long reverse loop can be easily handled by an auto-reverser. Just be sure to provide enough feeders to adequately power the loop.

The reverse loop should be longer than the longest train so that the entire train, from the lead loco to the trailing car, is affected by the change in polarity. Of course, for practical reasons, the reverse loop should be long enough to avoid having the train run into itself.

Rich

Alton Junction

  • Member since
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  • From: Dearborn Station
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Posted by richhotrain on Monday, July 17, 2017 5:17 AM

rrinker

 Probably the easiest way to handle a dogbone layout is to make the end loops the reverse sections. Then you can have an many crossovers between the two mains as you want without worrying about it. 

I agree. That way the crossover and the connector track and any other track work outside of the two reverse loops can maintain the same polarity.

Rich

Alton Junction

  • Member since
    December, 2015
  • 1,914 posts
Posted by BigDaddy on Monday, July 17, 2017 10:11 AM

I read junction and crossing as some sort of diamond crossing.  OP could have well meant a crossover.

Henry

COB Potomac & Northern

By the Chesapeake Bay

  • Member since
    September, 2004
  • From: Dearborn Station
  • 16,423 posts
Posted by richhotrain on Monday, July 17, 2017 10:32 AM

BigDaddy

I read junction and crossing as some sort of diamond crossing.  OP could have well meant a crossover.

 

Doesn't really matter if he makes the end loops the reversing sections since everything in between will be the same polarity.

Rich

Alton Junction

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