Southern's entire Electrostar fleet has been refurbished with new features, including phone-charging points and improved wifi.
A £100m project has refurbished over 300 London commuter trains, ensuring they remain in service for another 15 years.
The project, which took five years to complete, was celebrated at Southern's Selhurst depot in south London, with the final train due to return to service.
The last of the 304 "Electrostar" trains, also used for the Gatwick Express, will be back in service.
Author's summary: Refurbishment of 300+ trains completed.