When Richard Nixon became United States president in January 1969, Boyd left the Transportation Department to become the president of the Illinois Central Railroad, a position he held from 1969 to 1972. The federal government investigated the potential conflict of interest because that railroad had received aid from Boyd's department before he resigned, but no wrongdoing was found. Boyd was later the president of Amtrak until June 20, 1982, and the president of Airbus Industrie. He became the chairman of Warner Blue & Mahan, a Washington, D.C. based consulting firm working on new technology ventures, in 1994.
