There are lots of security cameras in the Tube stations.
Hmmm, suspicious looking character on the far left screen.
Never mind... just some American taking a photo of himself on the security screen.
The Metropolitan line is gradually putting new train cars into service. They're roomier, cleaner, quieter, and smoother. All of the cars are connected and you can walk all the way thru to find a seat (instead of being trapped in the car you originally boarded). Very nice.