The designation “HO” stands for “Half O.” It is one-half of O-scale trains. In the model train world, systems are classified as letters. HO scale trains are 1:87 real-life scale. These plans can inspire to get you started. Once you have your plans, look into tips for building your platform and so much more. Get ready to embark on a hobby that can last a lifetime. Classified as HOn3 gauge, these trains are modeled on narrow gauge train lines (the rails are closer together). This means that although HO and HOn3 cars and locomotives are the same sizes, the trucks (wheels) and rails (tracks) are different between the gauges so their model railroad tracks are not interchangeable. The “n3” in HOn3 stands for “narrow gauge, 3 feet.” Normal standard gauge in the United States, Canada, and Mexico is 4 feet, 8.5 inches between the rails. Any railroad with rails closer together is referred to as narrow gauge. These trains were popular in mining and lumber railroads like the southern Rio Grande region, Denver, and the Pacific, these train lines were three-feet narrow gauge lines. Think about how to add industries and scenery of your choice to give this simple plan a character all your own.