The tragic derailment of a speeding passenger train in Spain yesterday has now killed at least 78 people, with more than a hundred others hurt and many still in critical condition. The train, which was traveling from Madrid to Ferrol, left the tracks on a curve just outside the stop at Santiago de Compostela, and reports say it may have been travelling at more than twice the normal speed when it left the tracks. 

Firefighters and other rescues described a grisly scene that looked like "hell," with train cars torn in half and dozens of people trapped under burning wreckage.

Officials with the railway say the train itself had a "perfect" maintenance record and had even passed inspection on Wednesday morning. If true that would suggest human error was the cause of the crash, a theory supported by other media reports. The newspaper El Pais quoted one of the train's drivers, who was initially trapped in the wreckage, as saying that the train was traveling 190 kilometers per hour (about 118 miles per hour) as it rounded a curve just a few miles shy of the station. The normal speed limit on that part of the track is just 80 km/h. 

Because the train was so close to its next stop, there's also speculation that many of the passengers were getting out of their seats, preparing to disembark, which may have contributed to the high number of injuries and deaths.

Today also marks an important holiday Santiago de Compostela, a feast day in honor of St. James who is the patron saint of the town and is said to be entombed there. The festival — which brings large numbers of Christian pilgrims to the town, including many who were likely on this train — has been canceled out of respect for the deceased. Prime Minister Mariano Rajoy has also declared three days of national mourning.

Update: It appears that the crash was captured on a track surveillance camera, which someone has posted to YouTube. You can see the train leave the tracks as it heads into the curve without slowing down, then hit a retaining wall before taking out the camera itself. There also appears to be a small explosion above the train, but rather coming before the derailment as some witnesses said, it was most likely caused by the cars leaving the tracks and tearing the power lines strung above the track.