G Scale is a model railway scale that represents a ratio of 1:22.5, meaning that one unit on the model is equivalent to 22.5 units in real life. This scale is commonly used for outdoor garden railways, allowing for larger trains and landscapes that can withstand the elements. Trains and accessories in G Scale are typically made from durable materials, making them suitable for outdoor use. The larger size also makes it easier for enthusiasts to work with the models, providing a more accessible experience for both children and adults interested in model railroading.