Track Gauge/Scale
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  Popular Model Railroading Scale Chart

  Name             Proportion                Scale to foot            Track gauge            Minimum Radius            Feet to mile scale
  Z                       1:220                        1.4 mm                    6.5 mm                     5.75"                                 24' - 0"

  N                      1:160                        1.9 mm                    9.0 mm                      7.5"                                  33' - 0"

  HO                   1:87                          3.5 mm                    16.5 mm                    15"                                   60' - 7.5"

  S                       1:64                           3/16"                       7/8"                          22.5"                                82' - 6"

  O                      1:48                            1/4"                        1.25"                         23"                                  110' - 6"

  G                      1:22.5                        12.5 mm                  1.75"                         23 5/8"                            234' - 8"