A train struck a semi-truck in eastern Iowa on Wednesday, killing one person and injuring another, authorities said.
An Amtrak train has partially derailed after it crashed into a water truck on the tracks in California.
The derailed cars were carrying hot asphalt and molten sulfur, officials said.
At least a dozen train cars fell off the tracks, according to video that witness Caitlin Nolan shot.
Satuday's incident comes about two months after a Norfolk Southern train derailed in East Palestine, Ohio, about 50 miles northwest of Pittsburgh.
Meanwhile, a CDC team going door to door in East Palestine got sick during their investigation in early March.