At approximately 7:50 pm bells at the train station rang and red lights flashed, signaling an express train's approach. David Harris walked onto the tracks, ignoring a yellow line painted on the platform instructing people to stand back. Two men shouted to Harris, warning him to get off the tracks. The train's engineer saw him too late to stop the train, which was traveling at approximately 99 mph. The train struck and killed Harris as it passed through the station. Harris's widow sued the railroad, arguing that the railroad's negligence caused her husband's death. Evaluate her argument.