Six people are in a train sleeping car. One of them is murdered. Thus begins a fine thriller with some really good suspense. The story's underlying premise is clever and quite unusual for its time.
The main problem here is the dialogue, which makes character identification unnecessarily hard. In the first 13 minutes, nine major characters are introduced, but no names. People refer to each other as "you" and "miss" and "she". Fully 18 minutes elapse before we know the names of all six sleeping car occupants. Even then we have only names, but no way to connect the names with the faces. As the plot moves along, additional characters are introduced, which further muddles a suspect pool that is already unclear. Because of the sloppy script writing, this is one of the most frustrating murder mysteries I have ever watched. Some simple changes in the script's dialogue could have made the characters so much easier to identify.
The film's chilling suspense is reminiscent of Hitchcock. The solution to the whodunit puzzle is quite interesting, and foreshadowed by clues that are effectively subtle. Another plus is the presence of the lovely, and talented, Simone Signoret.
"Compartiment tueurs" is a good thriller. If the characters had been better defined the film could also have been a great whodunit.
