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Top Thrill Dragster

Most launched coasters built before Dragster utilized electricity and Linear Induction Motors or Linear Synchronous Motors to propel trains, but an electro-propulsive system would have required a much longer launch track than Dragster's hydraulic launch uses.  The system employs 32 hydraulic pumps that power 32 hydraulic motors.   Each grouping of 16 motors is attached to a planetary gear.  The two planetary gears drive a massive drum.  The steel launch cable winds around that huge drum multiple times.  The drum spins up to about 500 revolutions per minute during a launch.

Hydraulic pumps and motors that launch the world's fastest roller coaster

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