This Plus-Plus Tube is a 100-piece train building set that comes in a reusable, travel-friendly container and includes step-by-step instructions to build a Steam Train. This construction toy doubles as a portable activity for home, classroom, or travel, promoting fine motor skills, spatial reasoning, and early STEM learning through hands-on play. Bright red, black, yellow and white creative blocks — plus wheel elements — let children assemble a detailed locomotive or use the same interlocking pieces to design original vehicles and sculptures. This compact storage tube keeps pieces organized for easy cleanup and makes the set an ideal gift or travel-friendly creative kit.