The following story contains spoilers about Tuesday's episode of "This Is Us." (CNN) Six seasons, more than a hundred episodes and plenty of anticipatory grief led to an emotional hour of "This Is Us" on Tuesday. The penultimate episode of the series titled, "The Train," culminated in the death of the Pearson family matriarch, Rebecca Pearson [Mandy Moore] of Alzheimer's. The creator of the Emmy-winning series, Dan Fogelman, took viewers on a literal train ride in which Pearson encounters the loves of her life, both living and dead, before crossing over into the afterlife. At one point she's greeted by her former physician, Dr. Nathan Katowski [Gerald McRaney] who delivered her triplets in the first episode of the series, but this time he was her bartender, pouring her a well-deserved Vesper. "You're as tough as they come, Rebecca Pearson," he said. "And you, my dear, have earned a rest." Read More The Pearson children, … [Read more...] about We knew it was coming. ‘This Is Us’ airs most emotional episode yet