Question: what is the difference between o gauge and standard gauge?
Answer: Gauge. Gauge refers to the distance between the inside edges of the load-bearing rails. Various sizes of track gauge exist around the world and the normal O gauge track represents the Standard gauge of 1,435 mm (4 ft 8 1⁄2 in). "O gauge" refers to tracks that are 1.25 in (31.75 mm) apart.