A lap around the largest garden railroad in the world! This is the dynamite rio verde and eastern railroad located in Scottsdale, AZ. It is the largest in the sense that It has the longest mainline: 1,252 feet (x2), and it sits on the most land: 3 acres. It has over 3,800 feet of track total, but there is another that has over 4,000 so it loses in that category.