Proto-Sound 2.0 With The Digital Command System Featuring: - Durable ABS Intricately Detailed Bodies - Metal Wheels and Axles - Die-Cast 4-Wheel Trucks - Operating Die-Cast Metal Couplers - Colorful, Attractive Paint Schemes - Decorative Brake Wheels - Fast-Angle Wheel Sets - Needle-Point Axles - Operates On O-27 Track - Sliding Car Doors Unit