Did Robert Lincoln Ride the Funeral Train to Baltimore?

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I found in my files that there were only five direct members of the Lincoln family on the funeral train, when it started from Washington D.C.: Ninian Wirt Edwards (husband of Elizabeth Todd), Clark M. Smith (husband of Ann Todd), Brig. Gen. John Blair Smith Todd (son of Dr. John Todd and Elizabeth Smith), Charles Alexander Smith (brother of Clark M. Smith) and Robert Todd Lincoln. Also on board was David Davis, Associate Justice of the Supreme Court (was he family or a close friend?). Robert only rode from Washington, D.C. to Baltimore and returned from there with Nicolay, Hay and Davis.