HO scale model trains are a popular scale in model railroading, representing a ratio of 1:87 (3.5 mm to 1 foot). This scale is called HO because it is roughly half the size of the older O scale model trains. HO scale trains run on tracks with rails spaced 16.5 millimeters apart, designed to represent standard gauge railroad tracks in this scale. HO is the most widely used scale worldwide due to its balanced size, allowing detailed models that still fit in relatively small spaces. It is ideal for hobbyists who want a realistic model train experience without requiring the large space that bigger scales demand. HO scale model trains include locomotives, rolling stock, buildings, and scenery, often available in various levels of detail—from ready-to-run models to complex kits. They can be powered and controlled either by traditional analog direct current or more advanced digital controls like Digital Command Control (DCC), which offers sophisticated options like sound and lighting effects. Popular manufacturers include Athearn, Bachmann, ScaleTrains, Märklin, and others, offering a wide variety of products and prices. This scale is notable for its detailed realism and moderate space requirements, making it suitable for both beginners and experienced model railroaders.
