Whimsical Cartoon Train Inside a Mountain Cave

Cartoon-style 2D illustration of a cheerful train winding through a mountain cave. A round, smiling steam locomotive leads colorful cars—red, yellow, blue, and green—with oversized wheels. Big button eyes and a friendly grin on the engine. Puffy steam forms playful shapes. The cave walls are jagged rocks with stalactites and glowing mushrooms along the floor. Warm light pours from the cave entrance, casting long, playful shadows on the tracks. Bold outlines, flat vibrant colors, and exaggerated perspective convey motion and whimsy. Add tiny birds perched on rails and a distant mountain silhouette outside.