https://youtu.be/DNqzAC-rIS0
British Rail Class 319 trains at various locations, including Farringdon station where they are seen switching between 25kV AC overhead wire power supply and 750V DC third rail power supply.
The trains are also seen in many liveries, but not *all* liveries.
There are also a few views inside these trains plus one view of a High Speed Train in East Midlands Trains livery
Enjoy!
Simon