From the Nashville Republican Banner, Oct 31, 1867, page 4.
“Transportation at Half Price–The Committee of Arrangements for the Base Ball Tournament at Knoxville, have permission to announce that the fare of the East Tennessee and Georgia and the East Tennessee and Virginia Railroads will be only half price to members of any Clubs who desire to visit that city as competitors for any of the prizes. We have reason to believe that the Nashville and Chatanooga [sic] and the Memphis and Charlston [sic] Road will be as liberal.”
The ET&G and ET&V railroads were actually quite short, and only traveled east to Cleveland TN, and south to Dalton, GA. But if the Memphis and Nashville rail lines made the same discount, it might show the extent to which the railroads saw baseball as a business opportunity.