Model train scales
Distances taken for the external side of the gauges.
|
Name of Scale
|
Inches
|
Millimeters
|
Scale
|
|
Standard
|
2 1/8″
|
53mm
|
|
|
#1 – G
|
1 3/4″
|
45mm
|
1/32 – 1/29 (Narrow: 1/20.3, 1/22.5, 1/24)
|
|
O*
|
1 1/4″
|
31.8mm
|
1/48 (1/43.5 in UK)
|
|
S
|
7/8″
|
22.2mm
|
1/64
|
|
OO (US)
|
3/4″
|
19mm
|
1/76
|
|
HO
|
5/8″
|
16.5mm
|
1/87.1
|
|
TT
|
15/32″
|
12mm
|
1/120 (US)
|
|
N (OOO)
|
3/8″
|
9mm
|
1/160
|
|
Z
|
1/4″
|
6.52mm
|
1/220
|
|
O-3/16 **(O27)
|
1 1/4″
|
31.8mm
|
1/64
|
