Peter Miller pictured above said "Completely by chance, just had most exciting experience to be had on the Tube - inaugural journey of new advanced train on Victoria line!"
Kulveer Ranger, the Mayor's transport director, said: "Londoners have heard a lot of talk about investment on the Tube, but now they can see and experience the reality of the upgrades that they have been promised. The new trains are a fantastic, state-of-the-art addition to the Tube network, which - along with signal upgrades - will transform the journeys of those using the Victoria line." There's more on the upgrade & new trains here.
If you manage to find yourself in one, tell us what the journey was like & thanks to Utku for spotting Peter's experience.
He said that he managed to outgeek other Tube geeks on the train when he asked them how the signalling worked & how much software would need updating if a new station were added.