‘车厢’ literally combines ‘车’ (chē), meaning 'vehicle' or 'cart', and ‘厢’ (xiāng), meaning 'compartment', 'bay', or 'enclosed section'. Together, it refers specifically to a distinct, enclosed section of a larger vehicle—most commonly a train carriage (e.g., sleeper car, dining car) or a bus compartment (e.g., the main passenger area). Unlike generic terms like ‘车’ (car/vehicle), ‘车厢’ emphasizes the interior, functional space where passengers sit or goods are carried.

The word is neutral in register and used in both spoken and written Chinese. It appears frequently in transportation contexts—train announcements, ticketing systems, safety instructions—and occasionally in metaphorical or extended uses (e.g., describing a sealed-off room resembling a compartment). It’s not used for automobiles (cars) as a whole; for private cars, ‘车厢’ may refer only to the passenger cabin, but ‘车内’ (inside the car) is far more common.