Look at what I just found on Google Earth:
A broader view of the general area, showing more trucks full of track:
I must admit, I squee'd a little bit on discovering this! Go to Oktoberfest on Google Earth, roll the timeline thing back to 17/8/2011, and have a look for yourself! If you look back to previous Augusts and Septembers, you can see other rides being constructed too, but I can't determine which ones they are.

A broader view of the general area, showing more trucks full of track:

I must admit, I squee'd a little bit on discovering this! Go to Oktoberfest on Google Earth, roll the timeline thing back to 17/8/2011, and have a look for yourself! If you look back to previous Augusts and Septembers, you can see other rides being constructed too, but I can't determine which ones they are.