OO gauge

[oh-oh]

noun

1. a model railroad gauge of 3/4 inch (19 millimeters).

Word History and Origins

Origin of OO gauge¹

First recorded in 1920–25

Example Sentences

About six years ago, I bought an OO gauge model steam locomotive from Hornby.

From The Guardian

As one grew older and clockwork became electric, OO gauge rather then O, the answer turned out to be "not always".

From The Guardian