The title itself symbolizes the work: the story of a man beastly compared to a locomotive of the nineteenth century. Emile Zola delivers us here the best novel of the "saga" Rougon-Macquart which also reflects the unique personality of the author. It is this time in the history of Jacques Lantier (brother of Stephen), a man who seems normal but is in fact plagued by murderous impulses when faced with a situation involving a relationship carnal with a woman; The thread of the novel can be summed up in a few words: crime, sex, violence, adultery ... all told in the dark backdrop of the railways. Decidedly Zola can not help making social ...