LEGO 1966 / Classic / Supplemental Sets

Supplemental sets are the parts packs of the 1960s, sold so that builders could add to a basic set the bits they needed most. They held windows and doors in frames, plates in several sizes, corner bricks, gates and fences, turntables, wheels with axles and train couplers. Many of these parts were new at the time, and the packs were often the first way to get them, like the wheels LEGO introduced in 1962.

1966 LEGO Sets

1966 marked one of LEGO’s greatest milestones with the launch of the LEGO Train system. Sold in 42 countries, the range introduced a 4.5V battery-powered system and a 12V electrified track version for advanced users. Specialized parts such as hook couplers, flanged wheels, and curved track debuted alongside sets like 113, 114, and 115, setting a new standard for mechanical play. Accessories soon followed, including a whistle-controlled motor unit. These innovations, led by LEGO Futura and the process development lab, established Trains as one of LEGO’s most enduring product lines.