From the box: "An educational and fun trivia-type game of railroad facts, history & modeling." The six knowledge categories on each card are: People and Times, Engineering, Hobos and Slanguage, Railroadiana, Model Railroading and Caboose[appears to be general train knowledge]. Default game is to nine correct answers but the rules mention you can set the endgame to any number you like. The cards are color coded so they can be used with other trivia-type games [example: you could replace the Trivial Pursuit deck with this deck]. The questions are not easy.