Tens of thousands of people cheered as the olive-green jeep that has pulled the cedar urn with Castro's remains across Cuba since Wednesday rolled into Santiago de Cuba.
The ashes were paraded across the eastern city, stopping in front of a balcony where Castro gave a speech following his revolution's triumph in 1959.
Like other crowds along the four-day, 900-kilometre trip from Havana, this one chanted "I am Fidel!" after a series of Castro speeches played on a giant screen.
President Raul Castro, who took over when his brother fell ill in 2006, will deliver a much-awaited speech during the massive tribute with foreign dignitaries, ranging from presidents to Argentine football legend Diego Maradona, who called Castro his "second father."
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After a nine-day mourning period, the remains will be interred tomorrow during a private ceremony at the Santa Ifigenia cemetery, where the 19th-century independence hero Jose Marti is buried.
Castro's death on November 25 at age 90 has fueled discussions about his divisive legacy and the direction the country may take without the omnipresent leader, who ruled for almost half a century.
After Fidel is laid to rest, all eyes will turn to Raul Castro's next move. He has implemented modest economic reforms, vowed to step down in 2018 and restored diplomatic ties with the United States.
Castro has been hailed in almost religious terms since his death, with the communist party newspaper Granma calling him the "eternal comandante."
Children in school uniform, veterans in military fatigues and entire families waved Cuba's flags and chanted "Fidel!" as the ashes arrived in Santiago.
The government had already led a huge rally with two dozen foreign presidents in Havana on Tuesday, but Santiago holds a special place in Castro's life.
"This is the cradle. Everything started here," said Victor Rivera Coca, 52, a cook who came from the town of Las Tunas, three hours away by car, with his wife and three-year-old son.
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