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The standards vary by era modeled and equipment.
<div><a href="https://www.nmra.org/sites/default/files/standards/sandrp/pdf/rp-7.1_tangent_track_centers_and_clearance_diagrams_2019.01.pdf">https://www.nmra.org/sites/default/files/standards/sandrp/pdf/rp-7.1_tangent_track_centers_and_clearance_diagrams_2019.01.pdf</a>
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<div>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. <br>
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<div dir="ltr">Phil Edholm
<div>PKE Consulting</div>
<div>Office 925 264 9420<br>
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<div>C<span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.298);">ell 408 832 5618</span></div>
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<blockquote type="cite">On Nov 8, 2021, at 10:11 AM, ACCRS O Scale list <accrs-o@mail.accrs.org> wrote:<br>
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<div dir="ltr"><span>Message From: Steve Bull sbullfox@gmail.com</span><br>
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<div dir="auto">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.
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<div dir="auto">Steve Bull</div>
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<div dir="ltr" class="gmail_attr">On Mon, Nov 8, 2021, 10:04 AM ACCRS O Scale list <<a href="mailto:accrs-o@mail.accrs.org">accrs-o@mail.accrs.org</a>> wrote:<br>
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Message From: Tony Long <a href="mailto:tony.long@outlook.com" target="_blank" rel="noreferrer">
tony.long@outlook.com</a><br>
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<p class="MsoNormal">I have a question on O scale measurements and wanted to check with others.</p>
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<p class="MsoNormal">Conversion – what is the correct conversion for 2 Rail 1:48 scale. I’ve seen it listed as 1:43.5</p>
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<p class="MsoNormal">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.
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<p class="MsoNormal">Millimeters is what I want to sketch with.</p>
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