Welcome to the Zm page. Zm, what does this mean. "Z" indicates we are modeling in Z-scale a ratio of 1 to 220 or 1:220 or 1 foot in the model equals 220 feet in the real world. Z scale track gauge of only 6.5 mm. Standard gauge track in the real world is 4ft 8.5 inches between the rails. The second letter, "m" indicates that instead of standard gauge we are modeling narrow gauge. This could be anything from 18 inches between the rails to 42 inches between the rails. Narrow-gauge z-scale system with only 4.5mm gauge track which corresponds to metric gauge in prototype and is designated as Zm scale following the NEM standard scale naming system.

(Zm = Z-scale Narrow Gauge)