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,
The current procedure appears to involve entering the carriage from one door, walking through to do the visual inspection, then pressing a button on the doorway of the second door to close up. Presumably the exact same system could be used with open gangway carriages by simply having the staffer remain on the train and pressing each door close button without stepping back to the platform (until reaching the end of the train).