S Gauge is a model train scale that represents a ratio of 1:64, meaning that one inch on the model equals 64 inches in real life. This scale is popular among hobbyists for its balance between size and detail, making it easier to handle than smaller scales like HO Gauge while still allowing for intricate designs. Trains and accessories in S Gauge typically run on a track that measures 2.5 inches wide. This gauge is often used in both electric and steam locomotives, providing a diverse range of options for collectors and modelers.