President George W. Bush nominated Biden to Amtrak’s board and he was confirmed by the Senate in July 2006, according to congressional records. He served on the board until February 2009.
That's right, he resigned shortly after his father (Joe Biden) took the office of Vice President.
https://www.govinfo.gov/content/pkg/CHRG-109shrg65181/html/CHRG-109shrg65181.htm
