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Your issues will be no different with a 12.5 degree crossing than with a #4 or #5 turnout.  (Frog angle is similar)  You will actually likely have more issues with #8 or larger turnouts (#10, #12 etc), as the frog angle narrows, it becomes more likely that an out of guage wheel or warped truck will pick the frog point.  Had a recent run SD40-2 from Intermountain that liked to pick #6 Peco Code 83 frogs.  I placed it on a flat surface and found both trucks were warped.  I sent it back (for cost of postage) and they fixed it for free.   Use a NMRA guage to check the wheel guage, and you will have fewer problems. [quote user="Attuvian"] A rather quick check on the 'net seems to indicate that Atlas may make the only ones narrower that 30 degrees, selling 19 and 12.5 degree assemblies.  I do not wish to ugrade the junction by replacing it with a slip switch.[/quote] PECO makes a Code 100 12 degree crossing and a 24 degree crossing. <a href="https://www.walthers.com/code-100-streamline-crossing-short-insulfrog-24-degree-18-quot-45-7cm">https://www.walthers.com/code-100-streamline-crossing-short-insulfrog-24-degree-18-quot-45-7cm</a> I dont know why they say the 24 degree is 18" Nothing on that piece of trackwork is 18".  <a href="http://www.peco-uk.com/imageselector/Files/Track-templates/SL-93.pdf">http://www.peco-uk.com/imageselector/Files/Track-templates/SL-93.pdf</a>   <a href="https://www.walthers.com/code-100-streamline-crossing-long-insulfrog-12-degree">https://www.walthers.com/code-100-streamline-crossing-long-insulfrog-12-degree</a> <a href="http://www.peco-uk.com/imageselector/Files/Track-templates/SL-94.pdf">http://www.peco-uk.com/imageselector/Files/Track-templates/SL-94.pdf</a>    And apparently a 22.5 degree one I was unaware of: <a href="https://www.walthers.com/crossing-code-100-medium-22-1-2-degree">https://www.walthers.com/crossing-code-100-medium-22-1-2-degree</a>
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