Elizabeth Line

Saw this shiny new train coming into Paddington late last night.  The first stages of the Elizabeth Line aren't due to open until December, so I assumed it was a trial run (there were no passengers).  But from reading this, it sounds like they might have started using the trains for Paddington to Heathrow.

https://tfl.gov.uk/travel-information/improvements-and-projects/countdown-to-launch
https://tfl.gov.uk/travel-information/improvements-and-projects/elizabeth-line