Went along to this the other day because a few of our friends were skating in it. For something that sounded like a slightly dubious concept (use skateboarding to promote something unrelated), it turned out to be pretty amazing.
The guys we’re skating with hacked iPod touch’s in their socks that tracked their position on the ramp, this was then fed into a laptop, it created the animation in realtime which was displayed onto the ramp by two overhead projectors. Pretty impressive stuff, which also clearly related to Tron. Thumbs up!
This was filmed by Graeme Taylor at Bath Spa station. He used a high-speed camera to film the station as the train sped through and then slowed the footage down so that the train appears to be moving at walking pace.