Lego Trains
Lego Trains (stylized as LEGO Trains) is a product range and theme of the construction toy Lego, which incorporates buildable train sets. The Lego Trains theme became a sub-theme of Lego City in 2006. Products in the range have included locomotives, tracks, rolling stock, stations, signal boxes, and other track-side buildings and accessories. The theme is popular among adult fans, as well as children, and has spawned international associations and conventions. The train system is sometimes referred to as 'L-gauge' among Lego fans, in reference to traditional model railway scales. Lego trains use a nominal gauge of , based on 5-stud track centerlines gauge, corresponding with a circa 1:38 scale. Development The design of Lego trains has developed substantially, with several different systems introduced, with varying degrees of cross-compatibility. The Blue Era (1966-1980) Lego trains were first introduced in 1966 with Lego set number 080. The train sets used blue rails, and the first train sets were simply push-along. Set number 115 introduced 4.5 volt battery-operated trains (initially the battery box was handheld, but train sets soon contained a railcar that carried the battery box), and train sets numbered 720 (1969) and up operated on 12-volt electrified rails, introduced in