S scale

S scale
German S scale model railroad
Scale316 inch to 1 foot
Scale ratio1:64
Model gauge0.883–0.905 in (22.4–23.0 mm)
Prototype gauge1,435 mm (4 ft 8+12 in) standard gauge

S scale (or S gauge) is a model railroad scale modeled at 1:64 scale, S scale track gauge (space between the rails) is 0.883–0.905 in (22.4–23.0 mm). S gauge trains are manufactured in both DC and AC powered varieties. S gauge is not to be confused with toy train standard gauge, a large-scale standard for toy trains in the early part of the 20th century.