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I think the Book Train Game in the CMT is just a word game people play and you just jump right into it.
Sometimes in the games forum people will do a train type game for jsut one book. Sometimes someone with a heavily WL or an out of print book will be willing to "loan" it out to people to read. People get in line, pay a credit (to cover postage), the book gets mailed down the line and there's a time limit to read the book and mail it to the next person in line. For this one you might need some gaming experience before you can start one. You'd have to ask the game moderators. You would just need a credit to join one.