I love the mayhem and total destruction!
I also really like the self-balancing mechanic of gaining and losing speed. The faster you go the harder it is to get more speed and the easier it is to lose it, but losing the speed by smashing into other trains is the whole point of the game and you get rewarded with power and score.
I thought I was done, but I had to play it again after I read about the bazooka power-up. I was not disappointed! Pure carnage!