G scale is a model railway scale that represents a ratio of 1:22.5, meaning that 1 unit on the model equals 22.5 units in real life. This scale is commonly used for outdoor garden railways, allowing for larger trains and landscapes that can be enjoyed in a backyard setting. Trains and accessories in G scale are typically made from durable materials to withstand outdoor conditions. The larger size also makes it easier for hobbyists to work with the models, providing a more accessible experience for both beginners and experienced modelers.