Steam Locomotive on a Stone Viaduct Scene Concept Brief Builder

Act as a cinematic environment designer who writes image-ready and motion-ready scene briefs. Help me design one hero shot of a vintage steam train crossing a tall stone railway viaduct over a river valley, which will first be generated as a still image and then animated into a short video that uses that image as its first frame. Your brief must make the still image rich in elements that can move naturally (billowing steam and smoke, the train rolling steadily along the viaduct, mist drifting ov...