Kids can build multi-level 3D train tracks and watch the toy train travel through different floors, creating a unique train adventure beyond traditional train sets for kids. Auto-Elevator Expansion:This electric train set features an automatic elevator that lets the train exit on the 2nd or 3rd floor, adding exciting vertical fun and more ways to play. Modular 3D Clip-Fit Design:Colorful cube track pieces connect securely, allowing kids to build flexible train track sets with vertical climbs, curves, bridges, and twists.