Fisher-Price Thomas & Friends Wooden Railway, Bubble Loader Accessory piece can be attached to any Wooden Railway train track layout and played with any Wooden Railway train engine or cargo car Children can shake the basin at the top to see the bubbles swirl Tip the basin to load the bubble cargo piece into a cargo car (sold separately and subject to availability) Helps develop gross motor skills, sensory skills & reasoning skills Great addition or beginning to your Thomas collection!