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Looking for a C Track geometry solution for this simple “problem”
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Offline egonzinc  
#1 Posted : 19 January 2026 20:16:19(UTC)
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egonzinc

Puerto Rico   
Joined: 04/07/2013(UTC)
Posts: 47
Before I start fooling around with the pieces, I’m tapping this forums brain power to see if this simple task has a ( hopefully) simple solution.

I include an image.
Want to do an exit with radius 5 and maintain a radius 4 parallel on the inside, as much as possible.

Thanks in advance for any help. IMG_2369.jpeg (1,002kb) downloaded 47 time(s).
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Offline rbw993  
#2 Posted : 19 January 2026 21:44:28(UTC)
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rbw993

United States   
Joined: 19/08/2008(UTC)
Posts: 1,095
What turnout are you planning to use?
Modeling Immensee, mile/km 0 on the Gottard. SBB Era V.
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Offline JohnjeanB  
#3 Posted : 19 January 2026 23:08:45(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,712
Location: Paris, France
Hi Eduardo
I would think something like this
Sans titre.png
Please replace the 2205 reference by 24430 one

What do you think?
Jean
My layout videos
latest vid
marshalling yard
My Layout
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Offline egonzinc  
#4 Posted : 20 January 2026 00:00:37(UTC)
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egonzinc

Puerto Rico   
Joined: 04/07/2013(UTC)
Posts: 47
As soon as I posted, I started to play around with pieces or track and thought it would be impossible!
The end to the right is not 90 degrees from the beginning, but it will give some variety to the plan!
THANKS SO MUCH!

I rather use these turnouts, but I was wondering if there is a solution using the other turnouts, so it ends up at 90 degrees?
In another spot, similar situation, ending in 90 degrees would be preferable.
Conceivably use R3 and R4 radii instead of R4 and R5.

Again thanks so much for these designs
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Offline egonzinc  
#5 Posted : 20 January 2026 00:27:01(UTC)
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egonzinc

Puerto Rico   
Joined: 04/07/2013(UTC)
Posts: 47
This is the other problem spot.
The outer loop is R5 with some small straights added to go outside the pure R5 curve.
Need a “ get away” from the R5 loop.

IMG_2370.jpeg
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Offline mike c  
#6 Posted : 20 January 2026 01:21:34(UTC)
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mike c

Canada   
Joined: 28/11/2007(UTC)
Posts: 8,356
Location: Montreal, QC
You could try creating the outer curve using 24912, but at 1.1146m radius, it is quite a bit wider than R5.

Regards

Mike C
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Offline Ross  
#7 Posted : 20 January 2026 02:36:39(UTC)
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Ross

Australia   
Joined: 25/09/2006(UTC)
Posts: 959
Location: Sydney, NSW
Hi Eduardo,

Another option for you to consider.

rad5_rad4_with_24712.png


Originally Posted by: egonzinc Go to Quoted Post
Before I start fooling around with the pieces, I’m tapping this forums brain power to see if this simple task has a ( hopefully) simple solution.

I include an image.
Want to do an exit with radius 5 and maintain a radius 4 parallel on the inside, as much as possible.



Ross
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Offline Copenhagen  
#8 Posted : 20 January 2026 09:31:30(UTC)
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Copenhagen


Joined: 23/04/2019(UTC)
Posts: 550
Location: Copenhagen, Denmark
About the second hand drawn sketch: is it the plan to have six curves inside each other (or five inside the outer track) on the layout?
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