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The largest common scale (1:22.5 to 1:29), popular for outdoor garden railways.
G scale (Garden scale) encompasses several proportions from 1:22.5 to 1:32, all running on 45mm gauge track. The term covers multiple standards including Gauge 1 (1:32), G scale proper (1:22.5 for European narrow gauge), and various 1:29 American standards. Large scale trains are robust enough for outdoor garden railways, withstanding weather and providing impressive visual presence. LGB pioneered the modern garden railway movement, and brands like USA Trains, Bachmann, and Accucraft serve this market.