 About 1,200 gallons of diesel fuel spilled near the Penobscot River during a train derailment this week. Nick Song has more. Rail operator CSX Transportation said in a statement that the derailment occurred at around 5 p.m. on Tuesday at a CSX rail yard in Mattawamkag. The Lincoln Fire Department responded to the scene, reporting that a train engine had collided with a parked boxcar on the rails. The crash upended one of the cars and derailed another.