The answer is the author is a professor of language
When Shmuel recounts his journey on the train, he describes a horrible situation, which was completely different from Bruno's experience on his train ride. Shmuel tells Bruno that the cars were overcrowded to the point that passengers could not breathe. In contrast, Bruno recalls that there were two trains at the station when he left Berlin and naively believes that Shmuel boarded the wrong train. Even though Shmuel tries to explain to Bruno that the train he boarded had no doors, Bruno contradicts Shmuel and does not understand why Shmuel had such a negative experience on the train. Bruno and Shmuel's different perspectives are significant because they depict the contrast between those in authority (Nazis) and those in subjugation (Jews). Since Bruno is a German Nazi, he is treated with respect and enjoys a relatively comfortable train ride. In contrast, the Jewish prisoners, like Shmuel, were subjected to the horrible conditions of the tightly packed cattle cars that took them to concentration camps. Their differing perspectives further illuminates the difference in their backgrounds and situations. Despite Bruno and Shmuel's drastically different circumstances, the two boys become close friends.
