Simplify the following text for a Grade 5 native English-speaking person.
Original: The train is launched by a hydraulic launch mechanism to 128 miles per hour ( 206 km\/h ) in 3.5 seconds . At the end of the launch track , the train climbs the main top hat tower , reaching a height of 456 feet ( 139 m ) .
Simplified: To get up 456 feet , the train is launched by a machine to 128 miles per hour in 3 seconds .