NEW YORK--(BUSINESS WIRE)--Barnes & Noble, Inc. (NYSE:BKS), the nation’s largest retail bookseller and the leading retailer of content, digital media and educational products, today announced an exciting new promotional partnership with Amtrak, HarperCollins and leading magazine publishers to provide free eBooks and eMagazines to Amtrak customers during Amtrak Train Days. Starting May 9 with the kick-off of Amtrak Train Days, and running through November, NOOK is providing an enhanced trave