To every problem, there is a most simple solution. - Agatha Christie

All around us are people, of all classes, of all nationalities, of all ages. For three days these people, these strangers to one another, are brought together. They sleep and eat under one roof, they cannot get away from each other. At the end of three days they part, they go their several ways, never, perhaps, to see each other again.

To care passionately for another human creature brings always more sorrow than joy; but at the same time, Elinor, one would not be without experience. Anyone who has never really loved has never really lived..

"Trains are relentless things, aren't they, Monsieur Poirot? People are murdered and die, but they go on just the same. I am talking nonsense, but you know what I mean."
"Yes, yes, I know. Life is like a train, Mademoiselle. It goes on. And it is a good thing that that is so."
"Why?"
"Because the train gets to its journey's end at last, and there is a proverb about that in your language, Mademoiselle."
"'Journey's end in lovers meeting.'" Lenox laughed. "That is not going to be true for me."
"Yes — yes, it is true. You are young, younger than you yourself know. Trust the train, Mademoiselle, for it is le bon Dieu who drives it."
The whistle of the engine came again.
"Trust the train, Mademoiselle," murmured Poirot again. "And trust Hercule Poirot. He knows."