Standards
The differences in the various O gauge and O scale standards can be confusing. O gauge model railroad tracks typically have their rails spaced 1 1⁄4" or 32mm apart with the National Model Railroad Association (NMRA) standard allowing spacings between 31.75mm and 32.64mm.
Read more about this topic: O Scale
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—Alexander Herzen (1812–1870)
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—Henry David Thoreau (1817–1862)