G scale or G Gauge describes a variety of large-scale model trains and it is the common choice for garden railroads. These trains actually come in a range of scales, but all use the same gauge track.
Gauge
The gauge of the track is the distance between the rails. G Gauge, or more properly known as Number One gauge, has 1.77 inches between rails.
Scales
Scales for large-scale trains produced by companies to be run on Number One Gauge track range from 1:20 (.6 inch = 1 foot) to 1:32 with several other scales between.
Code
LGB, the European company that popularized large-scale trains, produces two heights or rail profile for its track called code 332 and and the shorter code 250. Mixing the code can cause derailments because of different rail heights.
Wheel height
American-made large-scale trains may not be able to run on the low profile 250 rail because their wheels require the greater height of 332.
Metals and ties
Most track used for G Gauge comes with brass rails, but some companies produce tracks with aluminum rail or other metals, claiming better electrical conductivity. Higher priced track also comes with more realistic looking ties,
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