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Reply to "Ozark Mountain RR, 10-6-2021, Rolling Stock partially moved, updated layout design"

@PRR1950 posted:

There are several discussions on the OGR forum about placement and use of turntables and roundhouses.  Suffice it to say that with the size of equipment you might run on those large curves, you will need a large turntable & roundhouse.  So, your minimum size requirements are probably going to be at least 4' x 9'.  Because they do require so much space, many modelers place them within their O72 / O81 loops which are built to allow reach access from almost all sides.

Finally, you should probably read some of the other discussions here about duck-unders.  No one can stop you from doing whatever you choose, but most here recommend against their use because they are not "future proof" when mobility issues arise.

Chuck

Thanks for your thoughts, I have probably read all of the hundreds of threads that discuss or cuss about duck unders here on the forums, but see little way to have 088/072 loops with an around the wall layout that I require without hinged track sections, lift outs or duck unders.  I do have alternative plans to not have a bridge, and instead keep the raised area over the table in a modified dog bone.

Regarding the room for turntable, I know that ideally to fit the large articulated steam engines I currently have, plus the Pennsy Centipede, AC6 cab forward, DDA40x etc, I would need a much much larger area.  I was contemplating just a diesel round table, but figuring number of tracks, and bays, I leaned toward the yards  Thanks for providing food for my thought process.  

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