Re: PSX-AR Installation Query

David Klemm


Because you can’t have the train across 2 sections and trying to go in to a 3rd. There would be no way for the PSX-AR to flip to the correct polarity. 

Sometimes it helps to draw these out using a red pen for one rail and black for the other. Then you can see the fight that will occur. 

David Klemm
11 PRO Max

From: <> on behalf of mgj21932 via Groups.Io <mgj21932@...>
Sent: Monday, January 20, 2020 8:00:55 AM
To: <>
Subject: Re: [w4dccqa] PSX-AR Installation Query
I am a novice at DCC and haven’t found an explanation for the limitation you describe regarding the length of an AR segment needing to be longer than the longest train.  I’ve read that too, but haven’t seen an explanation for why.  Do you know?  

On Jan 20, 2020, at 8:53 AM, John Cahill <johncahill25@...> wrote:

I have been adding a large extension to my layout (DCC HO) which sits between what were independent and unconnected High level and Low level loops with great each having a station and fiddle yard. I have created two Wyes, one above the other and both double track, with a very complex point system to allow any train from the new section cross onto any track on both levels of the original layout. However complex pointwork takes a lot of space and I now find I am constrained by one of the stipulations regarding auto-reversers in tray the AR section should be longer than the longest train. 

one one end of the new module, a long length of track leads into the Wye so no problem with that side. However on the second level Wye, there simply isn’t enough length to achieve a satisfactory length. Then, reading the PSX-AR Instructions hoping for inspiration I read on p.7 Section E Notes, that it is possible to use a short length of track provided one cuts ADDITIONAL gaps inside the AR gaps longer than any bogies which would be used on this AR section. My problem is that it doesn’t say (that I can see) how to wire these new sections. I would be grateful if anyone can illuminate my darkness in this as I don’t see another solution to my space constraints. 

Thanks in advance 
John Cahill 

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