At approximately 7:50 pm, bells at the train station rang and red lights flashed, signaling an express train's approach. Distracted in thought, David Harris walked onto the tracks as a shortcut to get to another platform at the station, apparently not seeing the flashing red lights nor the yellow line painted on the platform instructing people to stand back. He also apparently did not hear station bells. Two men shouted at Harris, warning him to get off the track. The train's engineer saw Harris but was unable to stop the train, which was travelling at approximately 55 mph. The train struck and killed Harris as it passed through the station.

Harris's widow want to know what potential claims she can raise against any party in this tragedy. Identify all potential defendants. What will she have to prove to be successful in her claim(s)? What defenses could potential defendants raise against the claim? And Please give a full explanation.