Nominal size Z0
The nominal size Z0 (Z0 = intermediate zero) denotes a model railway size on a scale of 1:60 and a track width of 24 mm. Z0 experienced its heyday from the late 1940s to the early 1950s when companies such as BECO (Brennecke & Co.), MALO (Bergmann & Co.) and Kirchner offered a variety of corresponding models. In the GDR, this nominal size was part of NORMAT (standardization and material).
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100 Years of Modellbahn, T&M Verlagsgesellschaft, p. 53, ISSN B4068-92001