Monsieur Bouc

In Murder on the Orient Express, Monsieur Bouc is the director of La Compagnie Internationale des Wagons-Lits. He is a friend, and countryman, of Hercule Poirot. He is a "short, stout, elderly man", with hair that is "cut en brosse". Monsieur Bouc originally occupied Compartment No. 1 in the Istanbul-Calais coach on the Orient Express, but he later moved to the Athens-Paris coach so that Poirot could occupy the compartment in the Istanbul-Calais coach.

Murder on the Orient Express (1974)
In the 1974 film, this character is played by Martin Balsam. The name is changed to Senor Bianchi and he is Italian. Similar to the novel, he moves out of his compartment in the Istanbul-Calais coach so that Poirot can occupy it. However, in this portrayal he moves into the Pullman carriage. Bianchi gets worried when a rescue train with a snow plough arrives. He wants the investigation concluded before the track is cleared and the train proceeds to Brod as he does not want to involve the local police. This sense of urgency is not found in the original story.

In this adaptation, Poirot presents the two solutions and leaves it to Bianchi, as director of the line, to pick one to present to the police.

Murder on the Orient Express (2001)
In the 2001 film, the character is played by Fritz Wepper. In this adaptation his first name is changed to "Wolfgang" and he is German, not Belgian.

In a voiceover at the end of the show, Poirot says that Bouc took early retirement from the Orient Express and set up a detective agency in Istanbul.

Agatha Christie's Poirot: Murder on the Orient Express (2010)
In 2010 adaptation, Monsieur Bouc was given the firstname Xavier. He looked significantly younger than described in the novel or other adaptations.