在这部在列车上喜剧片中,Bebert是六岁的男孩从他的弟弟在火车上被分开。喜剧随之而来的早熟娃娃的成年人的观察低于成年的活动，作为他的目的是与家人团聚。惊惶失措的成人继续搜寻失踪男孩在这欢乐的喜剧。
While their parents are busy shopping in a department store, Tiennot, who would rather chase girls, buys the complicity of Bébert, his little brother. In the train on the way back home, Tiennot, infuriated by his whims, leaves Bébert in the last car, which happens to be separated from the train and headed in another direction. Panic in the family: where on earth is Bébert? In fact, the little rascal has been taken in by the station master of Verneuil L'Etang, where he has a great time wreaking havoc in the SNCF network. A good-natured inspector is called on the spot and Bébert is finally reunited with his family.
