This is the second inversion, a Zero-G Roll. The train's up and down movement during the roll helps keep riders safely in their seats. I didn't feel any "hang time" while upside-down in the last two rolls.
A little of the first drop is visible on the left. Both the second and third inversions cut into the first hill's support structure. While I know that there is adequate clearance, it sure looks like you can reach up and hit some of the many wood and steel support beams during these rolls!
©2015 Joel A. Rogers.