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MODEL RAILWAY SCALES:

 Scale Name. Usage.   Gauge.  Proportion. Ratio.       Comments.
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  1"         Britain. 4 13/16" 1":1ft.    1:12.   Defunct Tinplate scale.
  1"         US.NMRA. 4.750"   1":1ft.    1:12.   } NMRA S-1 standard.
                      (121mm)  (25.4mm)           }   quoted metric equivalent.
  No.5 gauge. -       4 5/8in  -           -      Maerklin standard 1891.
  3/4"       US.NMRA. 3.5"     0.75":1ft. 1:16.   } NMRA S-1 standard.
  (19mm)              (88.9mm) (19mm)             }   quoted metric equivalent.
  11/16"     Britain. 3 1/4"  11/16":1ft. 1:17.45.Defunct Tinplate scale.

* SM45.      Britain. 45mm.   16mm:1ft.   1:19.05 Narrow gauge. 3ft.
* SM32.      Britain. 32mm.   16mm:1ft.   1:19.05 Narrow gauge. 2ft.

  No.4 gauge. -       75mm or 3in.         -      Maerklin standard 1891.
  No.3 gauge. -       67mm or 2 5/8in.    1:22.5  Maerklin standard 1891.
             USA.     2 1/2in  -           -      American Flyer.
  17/32"     US.NMRA. 2.500".  0.531":1ft.1:22.6  } NMRA S-1 standard.
                      (63.5mm) (13.5mm)           }   quoted metric equivalent.
  1/2"       US.NMRA. 2.500".  0.500":1ft.1:24.   } NMRA S-1 standard.
                      (63.5mm) (12.7mm)           }   quoted metric equivalent.
  Std-Gauge. USA.     2 1/8in. -           -      Lionel, Boucher.

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G.L.Procter. u/d 20/9/1997.