Originally Posted by
stifle
I don't think a walkthrough design will be compatible with the security search carried out at T5A when the trains turn from landside to airside, as this is done one carriage at a time by a Heathrow staffer who badges the door shut once done. That being said they could probably find a way to make it work if they wanted to,
In this day and age a vision system with a combination of cameras and laser scanners could do the job as effectively but in a fraction of the time! Any 'false positives' could trigger a physical check if needed.