A branch of American News, a Civil-War era company that distributed newspapers, books, and magazines. Wikipedia:

A branch called the Union News Company existed solely to sell newspapers and magazines on the railroads, with 300 newsstands in railroad stations which by 1893 covered 40% of the entire US railroad system, paying $1000 a day for exclusive rights. Under this system Union News could keep the Chicago Tribune out of the Chicago area train stations until the Tribune agreed to their terms. In 1958 the FTC found that Union News was operating nearly a thousand newsstands around the country (the next largest operator had 57), putting Union News in a position to dictate terms and demand rebates from publishers.

Read about its swift demise - it's an interesting story.