Just thought you'd want to know there's a sentence that's wrong on this page - it states "The faster the train is travelling, the smaller the hill you need to achieve airtime." - this is incorrect and it's the other way around, a faster train needs a larger hill to stay in g-force limits, and a slower train needs a smaller hill to produce airtime. For a slow train the larger the hill the less likely it will make it over and produce any airtime. For a faster train the smaller the hill the more excessive the g-force will be.