Model scales at a glance

Z scale: Trains built to a ratio of 1:220. A 75-foot locomotive measures 4 inches long. The rails of the track are 6.5 mm apart.

N scale: Trains built to a ratio of 1:160. A 75-foot locomotive is 5 1/2 inches long. The rails of the track are spaced 9 mm apart.

HO scale: Trains built to a ratio of 1:87. A 75-foot locomotive is 10 1/2 inches long. The rails of the track are 16.5 mm apart.

S scale: Trains built to a ratio of 1:64. A 75-foot locomotive is 14 inches long. The rails of the track are 7/8 inches apart.

O scale: Trains built to a ratio of 1:48. A 75-foot-locomotive is 18 3/4 inches long. The rails of the track are 1 1/4 inches apart.

G scale: These trains are built to a ratio of 1:22.5. A 75-foot locomotive is 40 inches long. G and other large-scale trains run on Gauge 1 track with rails 45 mm apart.

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2003, Kalmbach