UPDATE (July 30, 2017 12:10p): Arson investigators are on scene and trying to determine what caused the fire.
Officials said a train was threatened with fire, but was able to move out of the way.
Crews are still on scene mopping up and putting out hot spots.
Fire crews are battling a grass fire near Highway 99 near Golden State Avenue.
Initial reports are that fire is burning on west and east sides of highway 99.
The fire started around 11:00 a.m.
This is a breaking news story, check back for updates.