In most cases, knowing the individual meaning of the words only helps you to get a rough idea what the movie is about. Guess you'll have to wait for the producers or whoever is in charge of movie-making to give the film a title in Spanish.
I don't know that the phrase "rails and ties" has any specific meaning other than the structure upon which a train travels. The film is about a train accident, isn't it? I haven't seen the film so I can't speak of any metaphorical connection between the events and the title of the film.