(Roxana, IL)  —  Officials say several train cars derailed in Illinois, causing a small leak from the train’s cargo.  The derailment happened in Roxana between 9:30 and 9:45 yesterday morning.  Authorities say seven train cars derailed at the Wood River Refinery, causing a small amount of stent acid to leak from cargo train cars.  The acid is not considered dangerous.  Cleanup operations are in full swing and should wrap up today.  No injuries were reported.  The cause of the derailment is not known.