The Overland Limited Set in HO Gauge is the biggest and best for railroad enthusiasts.  A powerful 4-8-4 steam locomotive, 9 cars, and EZ track and roadbed system.  Specifics are:

Union Pacific 4-8-4 steam loco and tender with operating smoke and headlight features, grain car, three-dome tank car, flat car with logs, center-flow hopper, open quad offset hopper, two plug-door box cars, wood stock car, wide-vision caboose, 72" x 45" oval of EZ Track, power pack, speed controller, and instruction manual.