According to the article, the engineer of Metro-North commuter train crashed with a SUV on Tuesday. Before the tragedy happened, the engineer hit the emergency brake when he saw a Mercedes on the tracks, but this accident still happened. All the flashing warning lights and the stop signals were working properly, but the driver of the SUV drove into the tracks. Furthermore, investigators still are trying to find out why the SUV's driver stopped on the tracks. Last, investigators trying to figure out what are the reasons for this tragedy.