The Lionel 6-31926 R-T-R Area 51 Alien Recovery Train Set is a diesel locomotive model designed for the O gauge Three-Rail System. This train set is part of the Transformers franchise and includes an alien-themed design. It does not come with track or a transformer, so those must be purchased separately for operation. This ready-to-run train set is perfect for collectors and enthusiasts looking to add a unique and fun piece to their model railroad collection.