Jacques Lantier is a train engineer who is prone to violent seizures, a condition he attributes to his forefathers' habit of excessive drinking. Roubaud is a train conductor on the same railroad that Lantier works on, married to the much younger Séverine. When Roubaud catches wind of his wife's affair with her godfather, the wealthy M. Grandmorin, he kills him during a train journey in a fit of jealousy. He makes sure that Séverine is also present, making her an accomplice to murder. Lantier, despite having witnessed them quite clearly in the train corridor, hides the fact during the investigation as he is attracted to Séverine. They both begin an affair, all the while Roubaud becomes increasingly withdrawn and starts to gamble. Séverine urges Lantier to kill her husband so that they would be free but she is unaware of Lantier's unfortunate condition. (fonte: Imdb)

Una donna intesse una relazione con un uomo dalle pulsioni omicide incontrollate, credendo di poterlo controllare per fare in modo che uccida chi lei desideri.(fonte: Wikipedia)

La Bête Humaine (English: The Human Beast and Judas Was a Woman) is a 1938 French film directed by Jean Renoir, with cinematography by Curt Courant. The picture features Jean Gabin, and is loosely based on the novel of the same name by Émile Zola.
La Bête Humaine is partially set "on a train that may be thought of as one of the main characters in the film." Although generally listed as a romantic drama, it is sometimes considered a precursor to the film noir genre.
Contents:
The solitary Lantier, who drives a locomotive between Paris and Le Havre, is liable to go into a murderous fit if alone with a woman he desires. He only feels secure when driving the train with his fireman Pecqueux. However, he cannot fail to notice Séverine, the sexy wife of Roubaud, the deputy stationmaster at Le Havre. She in the past had an affair with the rich and influential Grandmorin. The jealous Roubaud forces her to meet Grandmorin on a train, There he robs and kills his rival, but by chance the off-duty Lantier is a witness. Because he is attracted to Séverine, he says nothing to the police, for which one night she rewards him. Then she starts suggesting to Lantier that he should get rid of her husband, but he fails the test. Instead, calling on her one night, he has a fit and kills her. Next day, after confessing to Pecqueux, he jumps to his death from the speeding train.
Cast:
Jean Gabin as Jacques Lantier
Simone Simon as Séverine Roubaud
Fernand Ledoux as Roubaud (as Ledoux Sociétaire de la Comédie Française)
Blanchette Brunoy as Flore
Gérard Landry as Le fils Dauvergne
Jenny Hélia as Philomène Sauvagnat
Colette Régis as Victoire Pecqueux
Claire Gérard as Une voyageuse
Charlotte Clasis as Tante Phasie, la marraine de Lantier
Jacques Berlioz as Grandmorin
Tony Corteggiani as Dabadie, le chef de section
André Tavernier as Le juge d'instruction Denizet
Marcel Pérès as Un lampiste
Jean Renoir as Cabuche
Julien Carette as Pecqueux
(Wiki: https://en.wikipedia.org/wiki/La_B%C3%AAte_Humaine_(film))