MODEL RAILWAY SCALES:

                               THE LARGER SCALES:
 Scale Name. Usage.   Gauge.  Proportion. Ratio.       Comments.
-------------------------------------------------------------------------------
* O 27.      USA.     1 1/4"   -       No scale.Lionel Toy. 27" diameter curves
* O 72.      USA.     1 1/4"           No scale.Lionel Toy. 72" diameter curves

* O.         France.  32mm.   23mm:1m.    1:43.478...
* O.         Britain. 32mm.   7mm:1ft.    1:43.5
  OF         Britain. 32mm.   7mm:1ft.    1:43.5 Fine scale.Wheel std.more acc.
  Seven Mil. Britain.         7mm:1ft.    1:43.5  Exact scale model.
* O.         Europe.  32mm.    -          1:43.5  } There are two competing -
* O.         Europe.  32mm.    -          1:45.   }   scales in general use.
  Om.        Europe.           -          1:43.5  narrow gauge. 1 Metre.
  On2 1/2.   Britain. 16.5mm. 7mm:1ft.    1:43.5  Narrow gauge.
  O Minex    Germany. 16.5mm.  -          1:43.5  Marklin-750mm.HO stud contact
* Oe         Germany. 16.5mm.  -          1:43.5  Fleischm.Magic Train -750mm.g

* O.         Europe.  32mm.    -          1:45.   See European 1:43.5 above.
  -                    -       -          1:45.   Diecast model cars.
  O 17.      USA.     1 1/4in 17/64:1ft.  1:45.176...
  O 17       US.NMRA. 1.250"  0.266":1ft. 1:45.2  } NMRA S-1 standard.
                      (31.8mm)(6.75mm)            }   quoted metric equivalent.


  Q          USA.     1 3/16" 1/4":1ft.   1:48.
  Proto 48.  USA.     1 11/16"1/4":1ft.   1:48. 1/4" AAR fine scale.1950s

* O.         US.NMRA. 1.250"  0.250":1ft. 1:48.   } NMRA S-1 Standard.
                      (31.8mm)(6.35mm)            }   quoted metric equivalent.

  On3.       USA.     3/4"    1/4":1ft.   1:48. narrow gauge. 3ft.
  On3.       US.NMRA. 0.750". 0.250":1ft. 1:48. } NMRA S-1 standard.
                      (19.0mm)(6.35mm)          }   quoted metric equivalent.
  On2 1/2(30)USA.     39/64"  1/4":1ft.   1:48. narrow gauge. 2'6".
  On2.       US.NMRA. 0.500". 0.250":1ft. 1:48. } NMRA S-1 standard. Ng. 2ft.
                      (12.7mm)(6.35mm)          }   quoted metric equivalent.


  IOM.       Britain. 12mm.  5 1/2mm:1ft. 1:55... Gem. I.O.M. 2'3in narrow g.
  Fn3.       Britain. 16.5mm.5 1/2mm:1ft. 1:55.418... Narrow gauge. 3ft.





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