National Transportation Safety Board spokesman Mark Rosekind also announced that oilfield services company Smith Industries was the owner of the truck that served as the float the veterans were on during Thursday's parade in Midland.
Rosekind said the company was cooperating with investigators, who expect to interview the driver on Monday. The NTSB declined to release the driver's name.
Rick B. Smith, Smith Industries' CEO and president, did not immediately respond to phone calls or emails seeking comment Sunday.
Investigators have said the truck began crossing the train tracks even though warning bells were sounding and lights were flashing. It was the second of two parade floats filled with wounded war veterans. The first float had already cleared the tracks when the accident happened. Four veterans of Iraq and Afghanistan were killed and 16 more people were injured.
According to the NTSB, the warning system was activated 20 seconds before the accident, and the guardrail began to come down seven seconds after that. Rosekind said everything functioned properly but that investigators would have to make sure the signal timing met the requirements for that particular crossing.
Some Midland residents said they think believe the signal time is too short and that the guardrails aren't completely down when a train comes whizzing by.
"The signals come on and the arms go down, but before they are fully down, the train is already at the intersection," said Mark Thomas, who lives blocks from the track and says he crosses it daily.
"These signal times are unacceptable," Thomas added.
The parade was organized by a group called Show of Support-Hunt for Heroes and has been an annual event in Midland for nine years. It was supposed to be the start of a three-day weekend of banquets, deer hunting and shopping in appreciation of the veterans' service.
Rosekind said investigators were also looking at whether the organizers had the proper permits for the parade.
"This is an entirely volunteer organization and activity, so there were a lot of things that were donated, and so that changes kind of the rules of what had to be filed," he said.
Midland is in Texas' oil-rich Permian basin, a region that has experienced a significant oil boom in recent years.
According to its website, Midland-based Smith Industries sells and manufactures oilfield service equipment. The website says the company provides steel and fiberglass tanks, separators, ladders, walkways and other equipment. The company has been in operation since 2000.
According to the NTSB, the train sounded its horn nine seconds before the crash. The guardrail hit the truck, and then the engineer pulled the emergency brake, trying to bring the train that was traveling at 62 mph to a screeching halt.
Killed were Marine Chief Warrant Officer 3 Gary Stouffer, 37; Army Sgt. Maj. Lawrence Boivin, 47; Army Sgt. Joshua Michael, 34; and Army Sgt. Maj. William Lubbers, 43.
Two of the injured were still at a Midland hospital Sunday afternoon, one in critical condition and another in stable condition.
___
Associated Press writers Ramit Plushnick-Masti in Houston; Danny Robbins in Dallas; Angela K. Brown in Fort Worth, Texas, contributed to this report.
(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)
Parade where vets killed used route for 3 years
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