About 40 gallons of hydrofluoric acid leaked from a rail car in Bloomington on Saturday night, but did not create a hazard for nearby residents and no injuries were reported, officials said.
Joe Arbona, a spokesman for Union Pacific Railroad, said the acid leaked at a rate of about four gallons per hour, with the total release being about 40 gallons. The acid is used in the making of glass, metals and computer chips.
San Bernardino County fire and Union Pacific workers cleaned up the spill, officials said.
The cause of the leak is under investigation.