This group consisted of Donald and Melania Trump, along with past presidents and their spouses.
Bob Dole, 95, an advocate of that legislation and the former Senate majority leader from Kansas, came in a wheelchair to honor his fellow World War II veteran.
Trump has said some rather negative things about the Clintons and the Obamas in the past.
This is the eighth funeral train in USA history and the first since Dwight D. Eisenhower's body traveled from the National Cathedral in Washington through seven states to his Kansas hometown of Abilene 49 years ago.
Bush's beloved service dog, Sully, faithfully joined his companion on his final journey to Washington, DC and on Tuesday sat at attention a few moments next to the casket as the President lay in state at the U.S. Capitol rotunda.
The train will bring the former president to his final resting place at the George H.W. Bush Presidential Library in College Station, Texas.
Mourners lined up to enter the Capitol beginning Monday evening for the public viewing.
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The three-month period halted the addition of new tariffs by both countries and was aimed at resolving the ongoing trade dispute. He had earlier also indicated that the deadline for an agreement could be extended.
The queen and Philip weren't the only ones who visited with and had a close relationship with George H.W. Bush. And President Bush was a bipartisan president.
Bush died Friday at age 94.
"I'm just here to pay my respects", said Jane Hernandez, a retired physician.
There were chills for sure in Smithtown, where Sully was trained by America's VetDogs.
The federal government and some financial exchanges will be closed on Wednesday for a day of mourning.