Debris litters the side of the railroad tracks in Biloxi, Miss., where a freight train hit a casino tour bus. Four people on the bus died in the crash.

JACKSON, Miss. — A survivor of a deadly bus and train wreck in Mississippi said Thursday the bus became lodged on a railroad crossing and that the driver yelled for all the passengers to get off, shortly before the train hit.

Four Texas tourists on the bus outing to southern Mississippi’s casinos were killed Tuesday and dozens injured. Passenger Justine Nygren of Austin, Texas, said the tour bus driver had stayed aboard the vehicle the entire time, trying to ensure people got out before a CSX freight train hit the bus.

“He told us to get off, and he was trying to see that everybody got off,” said Nygren, speaking by phone with The Associated Press after returning to her Texas home. “He stuck with the bus, I know that. He didn’t get off when we did.”

She said she was seated right behind the driver when the bus became stuck on the humped crossing in Biloxi. Nygren left through the front door and walked a short distance alongside the tracks, not looking back. As she did, the train hit the bus and pushed it past her, she said.

Another bus returned her and seven other uninjured survivors Wednesday night to Bastrop, Texas. The weeklong trip was organized by a senior citizens’ center in Bastrop, about 30 miles east of Aus.

The survivor’s account emerged as lawyers announced they were headed to court for the heirs of one Texas couple killed in Tuesday’s wreck.

Attorney Mikal Watts said he filed suit Wednesday against the railroad, the bus company and its unidentified driver for Peggy Hoffman’s son. Attorney Broadus Spivey is suing separately for heirs of Hoffman’s husband Ken, Watts said Thursday. He added the two lawyers are working together.