IMHO the internal doors on the Voyagers are the biggest problem with them that is totally down to Bombardier and the overall design (Virgin are to blaim for most of the problems). They are slow to open and close, they are noisy when operating, the timer means that they are opening and closing constantly when people are getting on and off at stations, they have no sensors to stop them closing when people are passing through, and they close very hard and have quite a delay before re-opening if something is trapped. It would be nice if they were a bit quicker to open, they really need quieter mechanisms (internal doors on Turbostars and Electrostars are almost silent) which would also make the constant opening and closing less annyoing, but most of all they need sensors to prevent them closing on people. Most other automatic doors do have them, e.g they are controlled by a pressure pad or infra red so won't close on people anyway (Mk2/3 doors, automatic doors on shops etc), or they have a beam that will stop the doors closing if it's broken (e.g lift doors). In many cases warnings will be provided that the doors are closing aswell. Voyagers have none of the above. It wouldn't be so bad if the doors were less agressive when closing, and if the sensors detecting trapped things were quicker to act and more sensitive.
