LEGO duplo 10425 Train Tunnel and Tracks Expansion Set

LEGO 10425 Train Tunnel and Tracks Expansion Set is a DUPLO Trains set released in 2025, containing 20 pieces. It includes a tunnel build, a 10-piece track, a funnel element, a 2-way points switch for changing directions, and an action brick that triggers light effects. The action brick illuminates the dark tunnel when activated by the interactive trains from sets 10427 and 10428. The expansion is designed to integrate with DUPLO train systems, with specific compatibility noted for sets 10427 and 10428.