ZZ scale is a model railroad scale with a standard gauge

Standard gauge

The standard gauge is a widely-used track gauge . Approximately 60% of the world's existing railway lines are built to this gauge...

 of only . Models for the scale are produced exclusively by Bandai

Bandai

is a Japanese toy making and video game company, as well as the producer of a large number of plastic model kits. It is the world's third-largest producer of toys . Some ex-Bandai group companies produce anime and tokusatsu programs...

, and depict Japanese prototypes

Rail transport in Japan

Rail transport in Japan is a major means of passenger transport, especially for mass and high-speed travel between major cities and for commuter transport in metropolitan areas.-Overview:...

 such as Shinkansen

Shinkansen

The , also known as THE BULLET TRAIN, is a network of high-speed railway lines in Japan operated by four Japan Railways Group companies. Starting with the Tōkaidō Shinkansen in 1964, the network has expanded to currently consist of of lines with maximum speeds of , of Mini-shinkansen with a...

 trains. To date, no other traditional scale railway support exists for the scale. However the field of miniature war games has a large selection of buildings, trucks and other accessories at 1:285 scale

1:285 scale

1:285 scale or 6 mm figure size is a US Army scale introduced in the late 1960s, and used for wargames and some scale model dioramas. It is used in miniature wargaming to depict large battles in a relatively small gaming area...

 and 1:300. Several suppliers make these in painted and unpainted form, and at several levels of quality.

Until the 2006 announcement of T scale

T scale

T scale , a.k.a. T Gauge, is a model railroad scale with a gauge of . It was introduced at the Tokyo Toy Show in 2006 by KK Eishindo of Japan, and went on sale in 2007. It is presently the smallest commercial model train scale in the world...

, ZZ scale was the smallest commercially available scale for model railroads.