Drivers who regularly cross over the tracks said they had seen the safety equipment appear to be malfunctioning a day before Wednesday's crash.
Pete Kotowski, the lead investigator for the NTSB, said investigators would conduct an exhaustive investigation into the accident, which also injured six other people as lawmakers were bound for a luxury retreat site in West Virginia for days of strategising.
Investigators have spoken with four eyewitnesses, interviewed one of the crew members from the train and scheduled an interview with the engineer, Kotowski said. They are "in the process" of trying to interview the driver of the truck, he said.
Gene Locke, who lives near the tracks in Crozet, said he pulled up to the crossing between 8:30 am and 9:30 am. Tuesday and saw that the safety arms were down and the signal light was flashing, but no train was approaching from either direction.
"I did not report this, as it was the first time this has happened in my observation since I have been using that crossing for several years," Locke told The Associated Press on Thursday.
Jane Rogers, who lives about 2 miles (3 kilometers) from the crash site, said that when she arrived at the crossing Tuesday, the gate was down, even though there were no trains approaching.
She said after waiting, one car in front of her and two cars behind her turned around. Then, as she started to turn around, the gate went up. One car then crossed the tracks, but Rogers said she waited another 30 seconds and the gate went down again. No trains passed, she said.
"The company has been subject to six roadside safety inspections with two of them resulting in vehicles being placed out of service," Kotowski said.
He also said the company had two reported crashes one in 2015 and one in 2016 but gave no further details on those accidents.
Wednesday's collision happened at an intersection that crosses the tracks at the top of a hill where visibility is limited.
No safety inspection records for the crossing were immediately available.
The State Corporation Commission, which inspects railroad facilities including track and equipment, does not maintain inspection records but turns them over to the Federal Railroad Administration, SCC spokesman Andy Farmer said.
A spokesman for the Railroad Administration said details on inspections would require a public records request.
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