Rail Tunnel and Rail - Extension kit (10425) is a toy that allows small children to experience even more exciting adventures with their railway sets. Pre-school children aged 2 and over can add a tunnel and additional rail segments to their (sold separately) interactive LEGO Duplo Town railway sets (10427 and 10428) and learn in a playful way. This creative toy includes a tunnel model and a 10-part railway track, including a funnel and soft switch, so that small children can change the direction of travel of the train. When the interactive trains from sets 10427 and 10428 roll over the action stone, the dark tunnel is illuminated. DUPLO bricks are designed to help you develop and play children's important abilities. When preschool children expand the railway track with the toy tunnel, they develop spatial awareness. And their ability to solve problems is needed to assemble the railway track. Only by logical thinking can they predict the direction of travel of the train. Patience and co