MODEL RAILWAY SCALES:

                        OO and HO.  THE POPULAR SCALES:
 Scale Name. Usage.   Gauge.  Proportion. Ratio.       Comments.
-------------------------------------------------------------------------------
   -          -        -      1/6":1ft.   1:72.   Military, aircraft models.
  Table Top. Europe.  5/8".    -           -      Bing 1921-1934.
  HO.        Britain  16.5mm  4mm:1ft.     -      H.Greenly. 1923 on.
  OO.        Britain. 5/8".   3.5mm:1ft.   -      Developed from Bing standards
  HO.        Britain. 16.5mm. 3.5mm:1ft.   -      Scale std, commercial support
  HOE.       Europe.  16mm.    -          1:87.followed from Bing/Bub 5/8"gauge
  HO         Europe   16.5mm.  -          1:90.   Trix Express.
  OOE.       Europe.  16.5mm. 1.1mm:1m.   1:91.  (90.909...etc)
* OO.        Britain. 16.5mm. 4mm:1ft.    1:76.2  BRMRA standards.
  EM.        Britain. 18mm.   4mm:1ft.    1:76.2 (EM =  Eighteen Millimeter)
  EM.        Britain. 18.2mm. 4mm:1ft.    1:76.2  revised standard.
  EEM        Britain. 18.83mm.4mm:1ft.    1:76.2  exact scale movement.
* P4.S4.     Britain. 18.82mm.4mm:1ft.    1:76.2  Final form of EEM. P4.
  OO Broad G.Britain. 28mm.   4mm:1ft.    1:76.2  GWR.Broad Gauge.7'0 1/4in
* OO9.       Britain. 9mm.    4mm:1ft.    1:76.2  Narrow gauge on N gauge track
  OO.        USA.     19mm.   4mm:1ft.            }Two different measurements
                      (3/4in) (5/32in)    1:76.8  } Pre-war commercial.
  OO.        US.NMRA. 0.750"  4.00mm:1ft. 1:76.2   }NMRA S-1 standard.
                      (19.0mm)(0.1575")            } quoted inch equivalent.
                                                          HO scale continues...
* HO         Europe   16.5mm   -          1:82.   Used by Rivarossi(European m)
                                                   Fleischmann etc 1940s-1970s
* HO         Europe   16.5mm   -          1:85.   Fleischmann c1965-75.
* HO.        Europe.  16.5mm.  -          1:87.   NEM standard.
* HO.        US.NMRA. 0.649". 3.5mm:1ft.  1:87.1  } NMRA S-1 standard.
                      (16.5mm)(0.1378")           }   quoted equivalent.
                              3.5mm:1ft. = 1:87.08571429...etc
  HOn3 1/2.  NZ.      12mm.   3.5mm:1ft.  1:87.   NZR. 3'6in.
  HOb5 1/4. Australia.18.5mm. 3.5mm:1ft.  1:87.   Victoria. 5'3" broad gauge.
  HOn3 1/2.  NZ.      12mm.   3.5mm:1ft.  1:87.   NZR. 3'6".
* HOm.       Europe.  12mm.    -          1:87.   Narrow gauge. 1 meter.
  HOn3.      US.NMRA. 0.413". 3.5mm:1ft.  1:87.1  } NMRA S-1 standard. Ng 3ft.
                      (10.5mm)(0.1378")           }   quoted equivalent.
  HOn900.             10.33mm. -          1:87.   Narrow gauge. 900mm.
  HOn800.             9.18mm.  -          1:87.   Narrow gauge. 800mm.
* HOe.       Europe.  9mm.     -          1:87.   Narrow gauge. 750-785mm.
                                                   HO on N track
* HOn2 1/2.  USA.     9mm.    3.5mm:1ft.  1:87.   Narrow gauge. 2'6".
  HOn2.      USA.     9/32".  3.5mm:1ft.  1:87.   Narrow gauge. 2ft.
  HOn2       US.NMRA. 0.276". 3.5mm:1ft.  1:87.1  } NMRA S-1 standard. Ng 2ft.
                      (7.01mm)(0.1378")           }   quoted equivalent.
  HOn600.             6.88mm.  -          1:87.   Narrow gauge. 600mm.
  HOz(HOf)   Europe.  6.5mm.   -          1:87.   Narrow gauge. 600mm.




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