The SSMEs weigh only one-seventh as much as a typical train engine but produce as much horsepower as 39 locomotives.
Far-Out Fact
The turbopumps on the SSMEs are so powerful that each could drain an average family swimming pool in 25 seconds.
Far-Out Fact
The energy produced by the three SSMEs is about equal to the energy generated by 23 Hoover Dams. The Hoover Dam provides enough energy to power half a million homes.
Far-Out Fact
The fuel from the ET flows into the engine at a rate of about 513 kilograms (1131 pounds) per second.