Top Thrill Dragster

There are sets of proximity sensors on the top of Dragster's hill that measure the time interval as the train passes two locations.  By knowing the time difference and the distance between sensors, the ride's computer can calculate the train's speed as it passes over the top of the ride.  The computer averages the speed of the last three trains when it calculates the forces required for the next launch.  So, if there are three train-loads of lightweight passengers followed by a train full of heavy passengers, there is a chance that the fourth shot will result in a "rollback" due to an underspeed launch.  Because 18 170-pound passengers add over 3,000 pounds to the weight of a train, adding the weight of these water bottles during testing helps ensure that the computers adequately measure the amount of effort required to launch a fully loaded train.

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