I imagine the person who ran a set of plarail train with solid background colour (most likely green) and placed the moving train on top of a standstill real life train bridge photo
My Trackmaster/Tomy/Plarail Photo Gallery Page (over 600+ photos and still under construction)
https://www.flickr.com/photos/183311600@N03/
https://www.flickr.com/photos/183311600@N03/