Santiago de Compostela, Spain (CNN) -- The driver of the train that derailed in northwestern Spain was charged Sunday with 79 counts of homicide by professional recklessness and an undetermined number of counts of causing injury by professional recklessness.
At least 79 people died as a result of last week's crash.
A court granted the driver, Francisco Jose Garzon, conditional release.
His train driver's license was suspended for six months. He must report to court weekly, and his passport was surrendered.
Earlier Sunday, the driver, who was hospitalized for two days while under police guard, was transferred to court, officials said. He was in court for more than five hours.
The data recorders from the train are still with police.
Questions have focused on the speed at which the train was traveling as it entered a curve in the track near Santiago de Compostela on Wednesday evening.
The crash on the outskirts of the city, which is popular with tourists and Christian pilgrims, shocked the Galician region and the rest of the nation.
Interior Minister Jorge Fernandez Diaz told reporters Saturday there are "rational indications" that the accident was the fault of the driver. Pressed on what those are, he declined to provide details.
Identifying the bodies
The crumpled wreckage of the eight cars sent careering onto their sides when the train derailed has been removed from the tracks, but the grim task of identifying the dead continues.
Maria Pardo Rios, a spokeswoman for the Galicia regional supreme court, told CNN late Friday that 75 victims had been identified.
At least 63 of the dead are Spanish, she said. Also among the fatalities are two U.S. citizens -- Ana-Maria Cordoba of Arlington, Virginia, and Myrta Fariza of Houston -- and some Europeans and Latin Americans.
Fariza and her husband were on their way to celebrate a Catholic festival. He was injured and later released from the hospital.
"Myrta was our loving wife, mother, sister, mother-in-law, aunt and friend, and words cannot express our sense of loss," her family said in a statement.
"To all who knew her, Myrta provided irreplaceable love, compassion, courage, friendship and support. We will miss her dearly."
As they are identified, most of the bodies are being returned to their families, the regional justice department said. DNA testing will be conducted on some remains to establish their identity, it said.
Police forensic experts said at a news conference Saturday there are 37 body parts that must still be tested to see whether they belong to bodies that have already been identified, or to others not yet known.
The death toll rose to at least 79 on Sunday morning when another person died, a representative for the regional health department said. About 70 people who were injured in the crash remained in the hospital Sunday, about 22 of them listed in serious condition, the official said.
At least five U.S. citizens were injured, said State Department deputy spokeswoman Marie Harf.
Local newspaper La Voz de Galicia said that a funeral service for the victims will take place Monday evening in the cathedral in Santiago de Compostela.
Going too fast?
Spanish news agency Efe and the national daily El Pais cited sources within the investigation as saying that the driver had said the train was traveling about 190 kilometers per hour (about 120 mph).
Elena Garcia, a spokeswoman for national railway Renfe, did not disclose Friday the speed the train was traveling on an express track, where cars can move as fast as 250 kph. But she said the speed limit for the bend of track where the crash occurred is 80 kph.
Rafael Catala, secretary of state for transport and housing, told Spanish radio network Cadena SER that the "tragedy appears to be linked to the train going too fast," but that the reasons it was going so fast are not yet known.
The express passenger service was nearing the end of a six-hour trip from Madrid to the town of Ferrol in northwest Spain when the crash occurred, the state railway said.
Security footage revealed how, as the train hurtled around a bend, its cars derailed and slammed on their sides into a concrete support structure for a bridge.
Flames burst out of one train car as another car was snapped in half. Rescue crews and fellow passengers pulled bodies through broken windows and pried open doors as stunned survivors looked on.
Maria Vigo, whose home is on the bank above the rail tracks, told CNN how she heard a crash, then the deafening squeal of metal on concrete.
"When I saw the rail car flip into the air, I imagined something just horrible had happened," she said.
She and husband Suso tried to help the injured, taking bed sheets to wrap around the injured and ropes to haul the survivors off the tracks.
Firefighter Miguel Angel Bello said the first four minutes after he arrived on the scene were a desperate race against time.
He and fellow firefighters smashed windows and kicked in doors to pull out the passengers trapped inside as rail cars went up in flames.
A young girl in the wreckage called out to him.
"She was under wreckage she said she wanted to get out and go home," he said. "But she died."
Survivor: We looked like the walking dead
Stephen Ward of Bountiful, Utah, who is in Spain serving on a Mormon religious mission, was one of the lucky ones.
Still patched up and wearing a neck brace, he told CNN's New Day show of his ordeal -- and his relief that he made it out alive and without permanent injury.
Ward, 18, blacked out when his car slammed on to its side, regaining consciousness only as he was being helped out of the train.
It took him a couple of minutes to grasp that what he was seeing outside was not a dream -- and that people were dead. "They were helping out other people -- there were bodies, there was screaming, there was smoke."
The survivors looked like the walking dead, he said. "I've got staples all over my scalp, I was covered in blood. They've scrubbed most of it off me now, but everyone was just covered in their own blood and occasionally the blood of others. It was gruesome to say the least."
Another victim, speaking from a hospital bed with his arm in a sling, told CNN affiliate Atlas that it seemed like the train was going fast.
"But we didn't know what was the maximum speed, so I thought it was normal," he said, "And suddenly there was a curve, the suitcases fell, and everything went dark. And I hit my head a ton of times, and 10 seconds later I was wedged between seats, and I had people's legs on top of me."
The derailment came on the eve of a public holiday to celebrate a saint's day, when more people than usual may have been traveling in the region. Planned festivities in Santiago de Compostela and across Galicia were canceled after the crash.
CNN's Karl Penhaul reported from Santiago de Compostela and Laura Perez Maestro from Galicia. CNN's Laura Smith-Spark wrote in London. CNN's Al Goodman, Lindsay Isaac, Jonathan Helman, Catherine E. Shoichet, Elwyn Lopez, Patrick Sung, Jill Dougherty and Mariano Castillo contributed to this report.