Former US president George W. Bush and former first lady Laura Bush watch as the flag-draped casket of former US president George H.W. Bush is carried to a train for the final journey to his burial place at his presidential library

College Station (United States) (AFP) - Americans offered their final farewells to George H.W. Bush ahead of his Thursday burial in Texas, concluding a four-day tribute to the 41st president that saw the nation briefly set aside its political divisions.

After a state funeral Wednesday in Washington that was attended by the country’s five living presidents and foreign dignitaries, Bush’s flag-draped casket was flown to Houston.

Bush, who died Friday at age 94, lay in repose at St Martin’s Episcopal Church there, where the Bushes worshipped for decades, and then was honored at a final memorial service by friends like James Baker, who served as his secretary of state.

Former US President George W. Bush embraces former US secretary of State James Baker (R) after he gave a eulogy during the funeral for former president George H.W. Bush in Houston

“His incredible service to our nation and the world are already etched in the marble of time,” Baker said in his eulogy, as he highlighted the sense of duty, service to country, and personal decency that drove Bush.

Fighting through tears, the 88-year-old Baker recalled how Bush’s deeds “expressed his moral character, and they reflected his decency, his boundless kindness and consideration of others, his determination always to do the right thing.”

- Final resting place -

People line the road as the hearse carrying the flag-draped casket of former US president George H.W. Bush heads to a Houston train station, for a final trip to the late leader's presidential library

Bush will be interred at his presidential library in College Station next to his wife Barbara, who died in April, and their daughter Robin, who died of leukemia at age three.

Son George W. Bush, the nation’s 43rd president, appeared somber at his wife Laura’s side, and stood ramrod straight outside the church as military pallbearers carried the casket to a waiting black hearse.

It was then placed on a train – with a locomotive painted in the colors and pattern of Air Force One, the presidential jet – for the final journey to the presidential library for a final ceremony and the burial.

At Wednesday’s memorial service in Washington, President Donald Trump and First Lady Melania shared a front row pew in the National Cathedral with past presidents Barack Obama, Bill Clinton, Jimmy Carter and their wives as an honor guard brought Bush’s casket into the prayer hall.

George W. Bush delivered an emotional eulogy in tribute to his father. The pair are only the second father-son presidential duo in American history, after John and John Quincy Adams.

Presidential couples Donald and Melania Trump, Barack and Michelle Obama, and Bill and Hillary Clinton shared a front row pew

“He showed me what it means to be a president who serves with integrity, leads with courage, and acts with love in his heart for the citizens of our country,” Bush said.

Wednesday’s funeral capped a national homage that saw Bush lie in state in the US Capitol rotunda.

Thousands paid respects to a statesman who steered the nation through turbulent times including the end of the Cold War and the marshalling of an international coalition to oust invading Iraqi forces from the tiny Gulf emirate of Kuwait.

On Thursday, Baker pointed to Bush’s eagerness to forge compromise and peace rather than rattle sabers.

“He had the courage of a warrior,” Baker said. “But when the time came for prudence, he always maintained the greater courage of a peacemaker.”

- An uneasy truce -

Since Bush’s death, Trump has traded his usual provocative posture for one of solemnity and respect for the Bushes, with whom he has often clashed since his meteoric rise in the world of politics.

As Trump toned down the rhetoric this week, Washington’s political heat was reduced from a normal boil to a simmer.

US President Donald Trump shakes hands with former US president Barack Obama as former first lady Michelle Obama looks on -- to her right is Bill Clinton, his wife and Trump's presidential rival Hillary Clinton, Jimmy Carter and his wife Rosalynn

But at Wednesday’s service, tensions were obvious.

Trump arrived and shook hands with Obama and former first lady Michelle Obama, but his body language turned cold as he failed to acknowledge Hillary Clinton, his defeated Democratic rival in 2016, or her president husband Bill.

Bush was a decorated World War II aviator who nearly died when he was shot down on a bombing mission.

He served as a congressman, envoy to China, director of the Central Intelligence Agency, and vice president to Ronald Reagan before winning the White House.