G scale trains were introduced by Lehmann Grosse Bahn (which translates into “Lehmann Big Trains”) in the 1960s. Because of its size and durability, these rugged toy trains are often used in outdoor garden railways, where hobbyists combine their love of trains with beautiful gardens and real scenic elements such as ponds and waterfalls. While the trains are fun to play with, even the smallest set-up will take up a lot of room. Options for different trains and accessories are limited as well. Depending on the manufacturer, G scale model trains range in scale from 1:24 to 1:32, but generally run together on the same gauge track.
From: Railroad Model Craftsmen Magazine December 25, 2016