G scale

G gauge
G gauge
Scale ratio	1:22.5
Standard(s)	LGB; NEM 010; NMRA S-1.3; NMRA S-3.3;
Model gauge	45 mm (1.75 in)
Prototype gauge	1,000 mm (3 ft 3+3⁄8 in) metre gauge

G scale or G gauge, also called large scale (45 mm or 1+3⁄4 inches), is a track gauge for model railways which is often used for outdoor garden railways because of its size and durability. G scale trains use a fixed track gauge of 45 millimetres (1.75 in) to accommodate a range of rail transport modelling scales between narrow gauge (~1:13‒1:19‒1:20), metre gauge (1:22.5), Playmobil trains (~1:24), and standard gauge (~1:29–1:32).^[3]^[2]

G-scale LGB (Lehmann Groß Bahn, "Lehmann's Big Train") was introduced in 1968 by Ernst Paul Lehmann Patentwerk in Germany. LGB products were intended for indoor and outdoor use; so the "G" became interpreted as "garden scale".

Most track is made of brass which can remain outside in all weather. Track can also be obtained in less expensive aluminium as well as oxidation-resistant, though more expensive, stainless steel.

Like other scales, large scale is sometimes used for model trains that run indoors on a track mounted against the wall near the ceiling.

^ ^a ^b Maßstäbe, Nenngrößen, Spurweiten [Scales, nominal sizes, gauges] (Specification) (Report). Normen Europäischer Modellbahnen NEM (in German). 2011. p. 1. I/IIm/IIIe/Vi/Vilp … Modell-Spurweiten 45mm ¹⁄₃ Zoll. (6) Für große Spurweiten ist auch die Angabe in Zoll üblich.
^ ^a ^b S-1.3 Standards for Scales with deep flanges (Standard) (Report). National Model Railroad Association NMRA Standards. 2009. p. 1. The term LS (Large Scales) is used to refer to range of scales developed to be able to be operated together, typically in an outdoors setting, for example a garden. LS models all use the same wheel and track profiles to facilitate interchange.
^ ^a ^b S-3.3 Standards, Guarded Track, for Deep Flanges (Standard) (Report). National Model Railroad Association NMRA Standards. 2010. p. 2. Large Scales … covers all common commercial scales running on LS 45mm gauge track (1:32, 1:29, 1:24, 1:22.5, and 1:20.3) without regard as to whether the trains are standard or narrow gauge.

[nem-010-2014-1] Maßstäbe, Nenngrößen, Spurweiten [Scales, nominal sizes, gauges] (Specification) (Report). Normen Europäischer Modellbahnen NEM (in German). 2011. p. 1. I/IIm/IIIe/Vi/Vilp … Modell-Spurweiten 45mm ¹⁄₃ Zoll. (6) Für große Spurweiten ist auch die Angabe in Zoll üblich.

[nmra-s1.3-2] S-1.3 Standards for Scales with deep flanges (Standard) (Report). National Model Railroad Association NMRA Standards. 2009. p. 1. The term LS (Large Scales) is used to refer to range of scales developed to be able to be operated together, typically in an outdoors setting, for example a garden. LS models all use the same wheel and track profiles to facilitate interchange.

[nmra-s3.3-3] S-3.3 Standards, Guarded Track, for Deep Flanges (Standard) (Report). National Model Railroad Association NMRA Standards. 2010. p. 2. Large Scales … covers all common commercial scales running on LS 45mm gauge track (1:32, 1:29, 1:24, 1:22.5, and 1:20.3) without regard as to whether the trains are standard or narrow gauge.

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