Model railroad trains first became popular when department store owners incorporated them into their Christmas window displays in the 1920s, and they've been a fixture of childhood and beyond ever since. Today model railroading is an extremely popular hobby, with both collectors and modelers who focus on every imaginable aspect of railroad history and operations.

Model trains have been available since the beginning of the railroads, but they weren’t considered a hobby until the 1880s and boomed in popularity in the 1930s.

Vintage model train collectors and hobbyists tend to specialize by scale or gauge (O scale, HO scale, N scale, Z scale, G scale), by type (brass, tinplate, steam, etc.), or by manufacturer (Lionel, American Flyer, Marx, Märklin). Until the National Model Railroad Association was formed in 1935, there were no standard gauges and a train from one manufacturer wouldn’t necessarily run on a track from another. The NMRA developed the standardized gauge system that is still in place today.

O scale model trains, built to a 1:43, 1:45, or 1:48 scale reached a height of popularity before World War II. True O scale trains ran on a two-rail track and were built to scale. Companies like Lionel and American Flyer made O gauge trains, but these ran on a three-rail track and are not as collectible as O scale.

HO scale model trains were introduced in the 1930s and became popular in the 1950s. HO, short for "Half O," is scaled to a 1:87 size and has the widest available range of rolling stock and accessories of all model railroad scales. Most HO scale trains run on a two rail track.

N scale is built to a 1:160 scale, much smaller than O and HO. First introduced in the 1960s, N scale model railroads are in demand because they don't require a lot of space to set up a layout. An even smaller scale, Z scale (built at a scale of 1:220), was first introduced in Germany in 1972 and became common in the U.S. shortly after.

G scale trains are the largest model trains and can be used for either indoor or outdoor (aka 'garden') model railroads. G scale trains, built at a scale of 1:22.5, are the largest electrically-powered model trains...

HO scale trains are currently the most sought-after, although O scale was most popular in the 1930s and '40s.

The earliest model trains were mostly made of tinplate. Tin trains, which were cheap and efficient, were produced until shortly after World War II, when other materials took the lead. After WWII, soldiers returned to the U.S. with brass model trains from Japan, sparking an interest in brass railroad sets. Although still made today, the most collectible brass model trains are those produced in Japan up through the 1970s.

Until the 1950s, steam locomotive models were more popular than diesel, and they continue to be desirable among collectors today. Steam model trains are categorized by wheel configuration and railroad name.

Some people tend to collect more by the railroad than the manufacturer, even creating railroad layouts that are historically accurate. Some of the most popular railroads to collect and recreate are the Pennsylvania Railroad, New York Central, Chicago and North Western, Union Pacific, Southern Pacific, Santa Fe, and Great Northern.

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