SANTIAGO DE COMPOSTELA, Spain - New video posted to YouTube shows the train going very fast as it went into a pronounced curve approaching the station in Santiago de Compostela Wednesday.
Mobile users can watch it here: http://www.youtube.com/watch?v=o32nxuHshv4
The train jumped the tracks in Catholic shrine city on the eve of a major religious festival.
Relatives of victims crash sobbed and hugged each other Friday near a makeshift morgue in a sports arena for the victims.
Seventy-three people were found dead at the scene of the accident and four died in hospitals, said Maria Pardo Rios, spokeswoman for the Galicia region's main court. At least three others also died, bringing the toll to 80, but no information was immediately available on where, said an Interior Ministry official who spoke on condition of anonymity because of ministry policy.
At least 141 people were injured -- some critically -- after the eight-carriage train carrying 218 passengers derailed about an hour before sunset Wednesday night.
Authorities did not identify any possible accident causes, but a spokeswoman with Spain's Interior Ministry said Thursday that the possibility that the derailment was caused by a terrorist attack had been ruled out. She also spoke on condition of anonymity because of the ministry policy.
It was Spain's deadliest train accident since 1972, when a train collided with a bus in southwestern Spain, killing 86 people and injuring 112. Prime Minister Mariano Rajoy, who was born in Santiago de Compostela, toured the crash scene Thursday with rescue workers and then went to a hospital to visit injured passengers.
A grim Rajoy told reporters that "for a native of Santiago, like me, this is the saddest day." He said investigations had been launched by judicial authorities and the Public Works Ministry to determine the cause as quickly as possible but declined to take questions from reporters.
Officials in the city canceled ceremonies for its annual religious festival that attracts tens of thousands of Christians from around the world.
"July 24 will no longer be the eve of a day of celebration but rather one commemorating one of the saddest days in the history of Galicia," said Alberto Nunez Feijoo, president of the region of Galicia where Santiago de Compostela is the capital.
Rescue workers spent the night searching through smashed cars alongside the tracks, and Pardo said it was possible that the death toll could go higher. Many of the dead were taken to a makeshift morgue set up in the city's largest indoor sports arena, where police and court officials were identifying the bodies. Relatives of victims sobbed and hugged each other outside at a nearby information point for families seeking news about their missing loved ones.
A regional Galicia health official, Rocio Mosquera, told reporters at a press conference early Thursday that 141 passengers from the train had been treated at area hospitals, with their conditions ranging from light injuries to serious. Some were still in surgery hours after the crash, while others had been treated and released.
As dawn arrived, cranes brought to the scene were used to lift the cars off the tracks and rescue workers were seen collecting passenger luggage and putting it into a truck next to the tracks.
The site itself was a scene of horror immediately after the crash. Smoke billowed from at least one car which caught fire; another broke into two parts. Residents of the urban neighborhood alongside the tracks struggled to help victims out of the toppled cars.
Rescue workers lined up bodies covered in blankets alongside the tracks and some passengers were pulled out of broken windows. Television images showed one man atop a carriage lying on its side, using a pickaxe to try to smash through a window. Residents said other rescuers used rocks.
State-owned train operator Renfe said in a statement an unspecified number of staff were also on board the train during the 8.41 p.m. (1841 GMT) crash on a section of tracks about 2.5 miles from Santiago de Compostela that came online two years ago. Spanish media said the train had two conductors aboard and that both survived.
Renfe and Adif, the state-owned company which manages tracks, signals and other railway infrastructure, were cooperating with a judge who has been appointed to investigate the accident, Renfe said.
Investigators are still working to determine the cause.
It was the third major rail disaster this month. On July 12, six people were killed and nearly 200 were injured when four cars of a passenger train derailed south of Paris.
On July 6, 72 cars carrying crude oil derailed in Lac-Megantic, Ontario, setting off explosions and fires which killed 47 people.
Catholic pilgrims converge on the Santiago de Compostela annually to celebrate a festival honoring St. James, the disciple of Jesus whose remains are said to rest in a shrine. The city is the main gathering point for the faithful who make it to the end of the El Camino de Santiago pilgrimage route that has drawn Christians since the Middle Ages.
The accident created a scene that was "Dante-esque," Feijoo said. He declared seven days of mourning to honor the victims.
Several injured passengers said they felt a strong vibration just before the cars jumped the tracks, said Xabier Martinez, a photographer who talked with them after arriving at the scene as rescue workers were removing dozens of bodies.
Passenger Ricardo Montero told the Cadena Ser radio station that "when the train reached that bend it began to flip over, many times, with some carriages ending up on top of others, leaving many people trapped below. We had to get under the carriages to get out."
Another passenger, Sergio Prego, told Cadena Ser the train "traveled very fast" just before it derailed and the cars flipped upside down, on their sides and into the air.
"I've been very lucky because I'm one of the few able to walk out," he said.
The Alvia 730 series train started from Madrid and was scheduled to end its journey at El Ferrol, about 60 miles north of Santiago de Compostela. Alvias are high-speed but do not go as fast as Spain's fastest bullet trains called AVEs.
The maximum Alvia speed is 155 mph on tracks made especially for the AVEs, and they travel at a maximum speed of 137 mph on normal gauge rails.
Other major train crashes in Spain over the decades include a 1944 accident on a train traveling from Madrid to the Galicia region that killed 78 people. A subway crash in the southern city of Valencia killed 43 people in 2006 and was blamed on excessive speed. The Madrid train bombings carried out in 2004 killed 191 people.