Cause of Train Bridge Accident Under Investigation - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Cause of Train Bridge Accident Under Investigation

FINLEY, Wash.- Train equipment that dangled off a bridge near Finley Monday night is removed.

Investigators now want to know why the bridge malfunctioned.

Union Pacific Railroad says they still have no idea why the bridge's drawspan started moving as tractor was going toward it.

A group of cars had already crossed the bridge, then, in between a few, the bridge started going up, at that point, the driver jumped out of the tractor onto the bridge, he suffered minor injuries.

Investigators say the bridge doesn't have an operator, so they're still trying to figure out whether it was triggered manually by the driver, or automatically.

"They'll talk to other operators of track equipment that went across there.  Any trains that may have passed the area to see if they've noticed anything out of the ordinary," said Mark Davis, a spokesperson for Union Pacific. 

About ten gallons of hydraulic fluid was spilled in the river and on the bridge. 

They put a boom in the water to contain it and are now working to get the bridge cleaned off.