These are the first LEGO trains, sold from 1966 to 1971 and run on 4.5 volts. The power came from a battery box holding three 1.5 volt batteries, carried in a tender or wagon behind the engine, and the motor of 1966 was the first LEGO motor of any kind. The track was blue rails clipped onto sleepers, which is where the name Blue Era comes from.
1971 LEGO Sets
In 1971, LEGO broadened its audience with new dollhouse and furniture sets aimed at girls, expanding its reach beyond traditional building themes. In Italy, the Minitalia range grew under import restrictions, offering locally produced sets compatible with the LEGO System. The year also introduced the 1×8×2 arch brick, adding architectural variety. These developments highlighted LEGO’s increasing design diversity and adaptability to regional markets.