HO Scale Trains refers to the size and scale of model train that is the most popular in most of the world. The scale used is 3.5 mm to one foot or one to eighty-seven. The name comes from the fact that the scale is half that of 0 scale which in turn comes from the day when there were 0, 1, 2, and 3 scale model trains. HO scale trains have all but replaced these older scales.

HO scale trains run on a small scale railroad track powered by electricity. On most sets, the power is controlled through the use of a transformer, so that applying more or less electricity controls the speed of the train, and reversing the polarity of the current changes directions. On larger, more complicated HO scale train setups, there may be multiple power supplies which control different blocks of the track.

People can control the layout and complexity of the track used by HO scale trains by putting together the pieces of tracks, which usually snap together, in straight and curved pieces, along with intersections and switched forks. These tracks can create a simple oval table top layout, to massive, complicated designs which can fill a room. It is also traditional to decorate the scenery around the track with scale buildings, scenery, and other model pieces to create the look of a real railroad track.

HO scale trains are a great hobby for kids and adults alike, and can spark an interest that lasts a lifetime.

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Photo Credit: James_Buck on flickr