Not possible. Every train is moving at the exact same speed all the time. Now the back row will have a longer decent at a high speed, but it does not go faster for longer. When I was a teenager I used to always want the back row because of this logic and I laughed at the fools who waited longer for the front row. Now I am a front row or nothing person on most coasters. The view is the best, and since you are in the front you face the most wind resistance which makes it FEEL like you are going faster even though you are not.