World's Greatest Hobby on Tour. The World's Greatest Hobby on Tour showcases the hobby of model railroading. Sponsored by the Hobby Manufacturer's Association - Model Railroad Division and by the World's Greatest Hobby Program, the show is intended to introduce the general public to model railroading in an entertaining, lively and family-friendly atmosphere. The hobby of model railroading has a unique ability to bring the family together in activities that teach many skills. Model railroad skills span from carpentry to artistry, from electrical engineering to historical research. Model railroading is truly the World's Greatest Hobby.