I arrived at T5B the other day on a flight from Basel, with an onward connecting flight from T5A. As I jumped on the train to the main terminal, it struck me that the only thing standing between me and the secure area of the terminal was a set of train doors.

Normally, passengers are forced to make their way to the FCC and re-clear security there after arriving on an international flight. But it occurred to me that someone could simply board the train at T5B, remain onboard for the return journey and pop out the other side -- voila, they're in the sterile area without clearing security.

As the train is automated and I've never seen an attendant on the platforms or train, it seems safe to ask: are there safeguards to prevent this type of cross-over? CCTV?

(And before everyone jumps on me about posting "security breaches" -- if an idiot like me can work this out after a few gin & tonics, anyone can...)