What train sets are collectible?

Collectible train sets often include vintage models from brands like Lionel, Bachmann, and Märklin, particularly those produced in limited editions or with unique features. Sets that represent historical railroads or iconic themes, such as the Polar Express or famous steam locomotives, are also highly sought after. Additionally, sets that include rare accessories, original packaging, or are in Excellent condition can significantly increase their collectible value. Enthusiasts often focus on specific eras, scales, or types of trains to build their collections.