Extend toddlers’ train adventures with the Train Tunnel and Tracks Expansion Set (10425) toy for toddlers. Preschool kids aged 2+ grow their learning adventures as they add a tunnel and extra track to their LEGO DUPLO Town interactive toy train sets (10427 and 10428, sold separately). This creative building toy comes with a tunnel build and a 10-piece track, including a funnel element and a 2-way points switch so toddlers can change their train’s direction of travel. The action brick lights up the dark tunnel when activated by the interactive train from sets 10427 and 10428. This kids’ learning toy encourages a toddler’s development. By extending the train track through the toy tunnel, preschoolers learn spatial awareness. Using problem-solving skills to combine the toy track and prediction skills to determine the train’s destination, toddlers develop patience and focus as they discover the many routes they can make. - Train track toy set – Toddlers aged 2+ extend their LEGO DUPLO railway adventures and learn development skills with the Train Tunnel and Tracks Expansion Set - Comes with lots of extra pieces to grow the fun – This creative building toy includes 10 track pieces, 1 action brick, a 2-way points piece and tunnel and funnel elements - Anytime gift idea – This extension set makes a fun treat for any toddler who loves to play with their LEGO DUPLO interactive toy train sets, sold separately - Quality toddler toys – All elements of this LEGO DUPLO toy have been tested to the max to ensure they fulfill demanding child safety standards - Track building that connects to toy train sets – Add this set to LEGO DUPLO Town interactive train sets (10427 and 10428) to create an even bigger learning journey for preschool kids - Skill-building playsets – LEGO DUPLO build-and-rebuild interactive train toys are designed to develop toddlers’ creative problem-solving, patience, focus and perseverance skills - Dimensions – This 20-piece set includes a tunnel measuring over 7.5 in. (20 cm) high, 6.5 in. (16 cm) wide and 6 in. (15 cm) deep