A model train set is a miniature railway system that includes trains, tracks, and scenery. These sets can vary in size and complexity, ranging from simple starter kits to elaborate layouts with detailed landscapes. Model trains are often made from materials like plastic, metal, and wood, and they can be powered by electricity or batteries. Enthusiasts of model trains often join clubs or attend exhibitions to share their passion. Popular scales for model trains include HO scale, N scale, and O scale, each representing different sizes of the trains and tracks. Collecting and building model train sets can be a rewarding hobby for people of all ages.