The engine was tested and runs but I did not assemble the whole set. The Bachmann G Scale Big Hauler Thunderbolt Express is a colorful 4-piece train set featuring a 4-6-0 engine. This model railroad is designed to run on G gauge tracks, offering a realistic and fun experience for train enthusiasts. With the trusted Bachmann brand behind it, this set promises high-quality details and performance for an immersive train experience. Ideal for collectors or hobbyists, this model railroad set is sure to delight fans of all ages.