Association with Harriman also goes back to daddy Samuel Prescott Bush.
https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/Samuel_P._Bush.html
In 1901, Bush returned to Columbus to be General Manager of Buckeye Steel Castings Company, which manufactured railway parts. The company was run by Frank Rockefeller, the brother of oil magnate John D. Rockefeller, and among its clients were the railroads controlled by E. H. Harriman. The Bush and Harriman families would be closely associated at least until the end of World War II. In 1908, Rockefeller retired and Bush became president of Buckeye, a position he would hold until 1927, becoming one of the top industrialists of his generation.