This is Northlandz and it's one of the largest model railroad showcases in the world. It holds a Guinness Book of World Records for being the World's Largest Model Railroad. Northlandz contains 100 miniature trains traveling on 8 miles of track. Northlandz is in the Guinness Book of World Records for being the world's largest model railroad. Northlandz contains 35 foot mountains, over 250,000 trees and 400 bridges one of which is 40 feet long.