Wikipedia
Trans-Europ-Express (film)
Trans-Europ-Express is a 1966 film written and directed by Alain Robbe-Grillet and starring Jean-Louis Trintignant and Marie-France Pisier. The title refers to the Trans Europ Express, a former international rail network in Europe. Also in the cast were Nadine Verdier, Christian Barbier, Charles Millot, Catherine Robbe-Grillet, and the director.
The film has been variously described as an erotic thriller, a mystery, and a film-within-a-film.