International tractors built after 1936 are painted a bright red color referred to as Harvester Red #50. Most International tractors also feature lettering across the sides of the hood that reads either "International" or "Farmall." The Farmall label designates the company's most ubiquitous line of row-crop tractors.
International Harvester began manufacturing farm equipment in 1902. Its first friction-drive tractor was introduced in 1905, followed in 1910 by the introduction of the Titan, a large and powerful row-crop tractor. In 1923, International began producing what was to become its most popular line of row-crop tractors, the Farmall Regular. International continued to innovate the Farmall line, producing dozens of models of Farmalls until the company's acquisition by Case in 1985. Many of the millions of tractors produced by International are still in use.
Early Farmall tractors are light but powerful and feature a characteristic narrow front with a single guide wheel. Second-generation Farmalls, manufactured between 1939 and 1954, belong to the "Letter Series." The letters A, B, H and M correspond to increasing engine power. In 1954, International began producing Farmall models in its "Number Series." Farmall tractors from this series were produced throughout the '50s, '60s and '70s, and can include features such as power steering, increasingly powerful and reliable engines, continuous-gear transmissions and the three-point hitch.