[Accrs-o] O Scale Dimensions

[ACCRS O Scale list]

The standards vary by era modeled and equipment.
https://www.nmra.org/sites/default/files/standards/sandrp/pdf/rp-7.1_tangent_track_centers_and_clearance_diagrams_2019.01.pdf

For old time, 3” centers and 4.25 vertical are recommended, but for modern it is 2.25 and 5.75 respectively. We should use modern for the club.

Phil Edholm
PKE Consulting
Office 925 264 9420
Cell 408 832 5618

On Nov 8, 2021, at 10:11 AM, ACCRS O Scale list <accrs-o at mail.accrs.org> wrote:

Message From: Steve Bull  sbullfox at gmail.com

I am working on a plan for a small O scale layout.  Could someone remind me what the distance between track centers and what the vertical clearance should be?  I have been using 4 inches for both.

Steve Bull

On Mon, Nov 8, 2021, 10:04 AM ACCRS O Scale list <accrs-o at mail.accrs.org<mailto:accrs-o at mail.accrs.org>> wrote:
Message From: Tony Long  tony.long at outlook.com<mailto:tony.long at outlook.com>

I have a question on O scale measurements and wanted to check with others.


Conversion – what is the correct conversion for 2 Rail 1:48 scale.  I’ve seen it listed as 1:43.5


Using that then the spacing between rails for 4’ – 8.5” comes to 32.99 millimeters.   I don’t have any two rail O scale track here to check that.     Is that correct?    Using 1:48 comes to 29.90 millimeters.

Millimeters is what I want to sketch with.



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