S Gauge / S Scale

Scales are standardized worldwide by any hobbyist and organizations. A model train's scale (1:64) is the relationship between its size (ratio between the real world and the model train) Gauge is the distance between a track's rails. In model railroading, beginners sometimes interchange the term scale and gauge. Most serious modelers are careful to use the terms correctly.

1:12 Large Scale

1:13.7 7/8 inch scale

1:20.3 G, Three-Foot Gauge on Gauge 1 Track

1:22.5 LGB and Bachman

1:24 Half scale

1:29 Aristo-Craft, USA Trains, standard gauge on #1 gauge

1:32 I scale

1:48 O scale

1:64 S scale

1:87.1 HO scale

1:120 TT scale

1:160 N scale
1:220 Z Scale

Track Gauge* by Scale (Scale in real-life is 4'8")
*Gauge is the distance between the outer rails.

Name of Scale	Inches	Millimeters	Scale
Standard	2 1/8"	53 mm
G	1 3/4"	45 mm	1/32-1/29 (Narrow: 1/20.3, 1/22.5, 1/24)
O	1 1/4"	31.8 mm	1/48 (1/43.5 in UK)
S	7/8"	22.2 mm	1/64
OO	3/4"	19 mm	1/76
HO	5/8"	16.5 mm	1/87.1
N	3/8"	9 mm	1/160
Z	1/4"	6.52 mm	1/220