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HO scale (H0 scale in continental Europe) is the most popular scale of model railway in most of the world outside the United Kingdom, where the slightly larger in scale OO gauge is most common. The name is derived from the German Halb-null ("half-zero"), because its 1:87 scale is approximately half that of O scale.Modern HO trains run on realistic-looking two-rail track, which is powered by direct current (varying the voltage applied to the rails to change the speed, and polarity to change direction), or by Digital Command Control (sending commands to a decoder in each locomotive). Some trains, most notably by Märklin of GermanyThe Federal Republic of Germany ( German: Bundesrepublik Deutschland is one of the world's leading industrialized countries, located in the middle of the European Union. It is bordered to the north by the North Sea, Denmark and the Baltic Sea, to the east, run on alternating currentAn alternating current AC is an electrical current, where the magnitude of the current varies in a cyclical form, as opposed to direct current, where the polarity of the current stays constant. The usual waveform of an AC circuit is generally that of a pe, supplied by a " third railThe use of a Third rail in model railroading is a technique that is sometimes applied in order to facilitate easier wiring. Two-rail versus three-rail system Early toy trains used two metal rail tracks like most real trains. However, manufacturers quickly" consisting of small bumps on each tie down the centre of the track.
HO scale trains first appeared in the United Kingdom in the 1930sCenturies: 19th century 20th century 21st century Decades: 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s Years: 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 Events and trends Technology Jet engine invented Link Trainer invented Sc, originally as an alternative to OO scale. It proved unsuitable for scale modelling UK trains. However, it became very popular in the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in, where it took off in the late 1950sCenturies: 19th century 20th century 21st century Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s Years: 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 Events and trends Technology United States tests the first fusion bomb. after interest in model railroads as toys began to decline and more emphasis began to be placed on realism in response to hobbyist demand. While HO scale is by nature more delicate than O scale, its smaller size allows modelers to fit more details and more scale miles into a comparable area.
In the 1960sCenturies: 19th century 20th century 21st century Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s Years: 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 Events and trends The 1960s was a turbulent decade of change around, as HO scale began to overtake O scale in popularity, even the stalwarts of other sizes, including Gilbert (makers of American Flyer) and Lionel Corporation began manufacturing HO trains. HO locomotives, rolling stock (cars or carriages), buildings and scenery are available today from a large number of manufacturers in a variety of price brackets.
Model railroad scales
