High Speed Track allows you to travel at a much greater speed than any other rails can. This also comes with a dangerous cost of exploding and most likely dying if you don't design your rails properly.
In order to use the speed advantage of High Speed rails, you will need to boost yourself to the high speed using Speed Booster Rails.
When traveling at high speeds, your rails can't have any corners or you will crash/explode. In order to avoid an accident on a turn, you will need to slow yourself down before you make one.
To slow down you can either use a booster rail that is switched off, or a transition rail. However sometimes you will need to use a couple of turned off booster rails, depending on how much you used before and how much you traveled.
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