In 1972 LEGO released the 4.5V and 12V train sets as part of the Blue Era which was named because of the rail color. These train sets used additional conductor rails mounted between the standard 4.5V rails and 12V motors contained in the same housings as the 4.5V motors, but with additional metal contacts attached to the bottom of the housings.
1985 LEGO Sets
In 1985, LEGO continued to innovate and diversify its offerings, reinforcing its position in the global toy market. A significant milestone this year was the introduction of the LEGO Paradisa theme, which targeted a broader audience, particularly girls, by focusing on more relaxed, vacation-themed sets with pastel colors and new minifigure designs. Paradisa was one of LEGO's early attempts to cater specifically to female audiences before the introduction of themes like Friends decades later. Additionally, the foundational themes like City and Castle continued to expand with new sets.