A caboose is a crewed North American railroad car coupled at the end of a freight train. Cabooses provide shelter for crew at the end of a train, who were formerly required in switching and shunting, keeping a lookout for load shifting, damage to equipment and cargo, and overheating axles.
A carriage is another term for a coach. A saloon is a private coach or compartment that can be reserved for an individual or group. A compartment is a private section within a coach that contains seats or bunks for a small group of passengers.