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Definitions - Model Railway Scales and Gauges

 

Scale Name                          Scale                                      Gauge                         Approx. Prototype

     Eqivalent Gauge                                   

 

Z                                              1.4mm/ft 1:220                      6.5mm                                    4’8¼”

 

N  US/Continental                 1.9mm/ft 1:160                      9mm                                       4’8½”

 

N UK                                       2.0675mm/ft  1:148              9mm                                       4’4½”

 

OOO                                       2mm/ft 1:152                         9mm                                       4’6”

 

TT  Continental                      2.5mm/ft 1:120                      12mm                                     4’8½”

 

TT UK                                     3mm/ft 1:100                         12mm                                     4’

 

HO                                          3.5mm/ft 1.87                        16.5mm                                  4’8½”

           

OO                                          4mm/ft 1:76                            16.5mm                                  4’1½”

 

P4                                           4mm/ft 1:76                            18.83mm                                4’8½”

           

S                                             3/16”/ft 1:64                           7/8”/22.25mm                        4’8”

 

O                                             7mm/ft 1:43½                        32mm                                     4’7”

 

O US                                       ¼”or 6.36mm/ft 1.48             32mm                                     5’½”

 

1                                              10mm/ft 1:30.5                      45mm                                     4’6”

 

3                                              1:22.5                                     2.5"                                         4’8½”

 

Narrow Gauge

 

Nn3                                        N UK                                       6.5mm                                     3’

 

OO9                                        OO                                          9mm                                       2’3”

 

HO9/HOe                              HO                                          9mm                                      2’6”

 

HOn3                                     HO                                          10.5mm                                  3’

 

OOn3                                     OO                                          12mm                                     3’

 

HOm                                      HO                                          12mm                                     1m

 

O9                                           O                                             9mm                                       1'4"

 

O16.5/On2¼                         O                                             12.5mm                                  2’4”

 

On30                                      O US                                       12.5mm                                  2’

 

                                                10mm/ft                                  32mm                                     3’

 

G                                             14mm/ft                                  45mm                                     1m

 

                                                14mm/ft                                  32mm                                     2’3”

 

                                                16mm/ft                                  32mm                                     2’

 

Various other scales do exist but are rare and I have not included them here.

 

This page has been constructed in good faith and I appologise for any errors  - Let me know!

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