A transwarp core was the energy reactor for transwarp drive.

In 2285, a transwarp core was installed aboard the USS Excelsior as part of Starfleet's transwarp project. (DS9 - The Lives of Dax short story: "Infinity")

In the 31st century, Starfleet vessels had transwarp cores. (ST short story: "The Law of Averages")

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