The main design of the Comet V is similar to its predecessors starting with the Comet III. Each trailer car has six doors for entering and exiting (like the Comet IV, the cab cars have five doors); the doors at the ends of the car are single-leaf with trap doors for low-level boarding while those in the middle are double-leaf but lack steps and trapdoors, only opening at high platform stations. The length of the cars at over the couplers remains unchanged from previous models and their width adheres to the standard loading gauge of .