Jumbo Bricks was a small theme exclusively manufactured by Samsonite from 1964 to 1972. The sets contained bricks larger than the normal system bricks, much the same as today's DUPLO bricks. However, unlike DUPLO, Jumbo Bricks are not to a relative scale to standard LEGO bricks. They were marketed towards children from nursery school through to first grade. There were six sets produced for this theme.
1966 LEGO Sets
1966 was another landmark year for LEGO, with international expansion reaching an all-time high—LEGO products were now sold in 42 countries. This year also marked the official launch of the LEGO Train theme, a major milestone in the company's history. With the development of an improved 4.5V electric motor and housing, thanks to the efforts of LEGO Futura and the process development lab, trains became a natural extension of the LEGO system.