Wow!
There's something similar at Blue Mountain in Collingwood. ( http://www.youtube.com/watch?v=0vOYlIefzRw ) We did it last summer, and it's definitely worth the ticket price! (Of course, it has seatbelts, a brake, not nearly as fast, more support than just a single metal beam that one teeters recklessly on...never mind, it's not similar ;D)