Oxnard, California (CNN)If Tuesday's fiery wreck involving a passenger train and a pickup truck in Southern California had occurred five years ago, more people likely would have been injured, and some might have died, officials with the commuter service said. (EDITED FOR BREVITY) The driver of the train, who was in the cab car, was able to hit the brakes, Lustgarten said. The train wasn't equipped with positive train control, which can automatically stop a train. Lustgarten said Metrolink was already planning to add the technology within months. Truck driver found a mile away The incident occurred just before 5:45 a.m. between the cities of Oxnard and Camarillo. Authorities said the 54-year-old produce truck driver from Arizona turned onto the tracks instead of at the highway intersection just beyond. Some time after the accident, A police officer driving near the scene of the accident spotted the driver walking along a road at least a mile away and stopped to talk to him, Oxnard Assistant Police Chief Jason Benites said at a news conference Tuesday afternoon. The driver was disoriented, Benites said. The driver was hospitalized and questioned by investigators. At a second news conference, Benites said the man, who drives for a company in Yuma, had been arrested on suspicion of felony hit and run. Emergency personnel treated many of the 49 people on board on tarps on a road adjacent to the tracks, video from CNN affiliate KABC showed. The produce truck, which was hauling a trailer, was "fully engulfed," in flames, according to the California Highway Patrol. A fire official said the fire trucks arrived within five minutes of the 911 calls. Four cars derailed, leaving three on their side, the NTSB said. The locomotive, which was pushing the train and was at the rear, appeared to still be on the tracks. Nine patients were taken to Ventura County Medical Center, Dr. Bryan Wong said. Three of the patients -- including the engineer -- were in critical condition. The conductor didn't require surgery, Wong said, but injuries to his heart and lungs necessitated constant evaluation. Wong said doctors were hopeful they wouldsee improvement in his condition over the next two days. Two women in critical condition both had surgery, Wong said. He said he thought both would make a full recovery.