LEGO Trains is one of the longer running themes that dates back from 1966 and ran up until 2006. During its run there were multiple sets released running on various power platforms from 4.5volt, to 9 and 12 volt sets. Later in 2011 LEGO released additional train sets using RC and Power Functions controllers under different themes like City.
1977 LEGO Sets
In 1977, LEGO expanded its product range with new sets that focused on city life, introducing models of houses, stores, and vehicles. This year also saw the introduction of the LEGO Expert Builder series, which laid the foundation for what would later become the LEGO Technic theme. These sets featured specialized elements such as beams, gears, axles, and connectors, allowing for more mechanically complex builds, including cars, airplanes, and construction equipment.