Z scale

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What Wikipedia says

Z scale is one of the smallest commercially available model railway scales (1:220), with a track gauge of 6.5 mm / 0.256 in. Introduced by Märklin in 1972, Z scale trains operate on 0–10 volts DC and offer the same operating characteristics as all other two-rail, direct-current, analog model railways.

Excerpt from the Wikipedia article “Z scale”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Janke at English Wikipedia, Public domain, via Wikimedia Commons.