웃는 동물들이 타고 있는 해맑은 초록 언덕의 카툰 기차

Prompt: A bright red-and-yellow smiling cartoon train moving along a curved track through green hills, animals peeking out of windows and sitting on top, all singing happily, musical notes floating in the air, sunny sky, vibrant flowers everywhere, joyful mood, 3D cartoon Pixar style