Grandpa Bill's Train Town
Reddit user Ryan Crets posted this GoPro-shot first-person train video of his grandfather's model train town, built over 15 years. According to Crets, the model is built to the popular HO scale (1:87), in which trains are about three inches tall. The entire room is about 20 feet by 15 feet. A second video with Cret's family gives a sense of the size of the room and set.