Those are pretty amazing shots. How long did it take to learn to do that? I like your honesty about leaving the bad ones on the cutting room floor. Out of interest, roughly how many shots would you expect to take to get each of those good results? Finally, did you get any sort of press access to the track or were you in amongst the crowd?
Canon EOS 5D III
Canon EF 24-105mm f4L IS, 70-200mm f4L IS
Canon GP-E2, Eye-Fi Card