Apologies for my ignorance. I wasn't aware that they were testing the doors on both sides of the train - in fact when they tested the doors only the doors on the platform side opened and closed. I don't have the insider information that others appear to have...
Thanks for your explanation. And the safety demonstration. I didn't realise there were emergency door releases. Is this a new thing? Those guys come up with some really cool inventions.
I must renew my guru card and sit the test again.