Steam Locomotive Crossing a Stone Viaduct (Image-to-Video Animation)

Start from the step 2 image "Steam Locomotive Crossing a Stone Viaduct over an Autumn River Valley" as the exact first frame, and animate it into a calm ${duration:6}-second cinematic shot. Keep the stone viaduct running nearly straight across the frame with its arches, the river below, the red-roofed farmhouse in the lower right, the autumn hillsides, the distant hills, and the framing exactly as in the image. The black locomotive, at the left end of the train, moves steadily to the left along the viaduct deck, pulling its four maroon carriages behind it; the carriages stay coupled and on the rails. Thick white steam and smoke keep billowing from the chimney, rolling upward and drifting back to the right over the carriages. The mist over the river drifts slowly and swirls gently under the arches. Leaves on the nearby trees stir softly in the breeze. Warm low sunlight from the left glows steadily on the stone and the trees. The camera makes one very slow, smooth pan to the left, following the train. Natural, realistic motion, no cuts, no new objects, no people, no text.