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Memory Alpha
Multiple realities
(covers information from several alternate timelines)
Nacelle pylon, Galaxy class

A Galaxy-class starboard pylon

Constitution class nacelle pylon

Constitution-class pylons

"If we go any faster, the nacelles are going to fly off the pylons."
– Charles Tucker III, 2155 ("The Augments")

A nacelle pylon, also known as a warp pylon or a nacelle strut, was a large support structure that connected a warp nacelle to the hull of a starship. A nacelle pylon housed the systems that directly linked a warp nacelle to a starship's warp core.

In the alternate reality in 2263, the USS Enterprise was engaged in battle with Krall and his army of Swarm drones above Altamid. Immediately overwhelmed, they attempted to flee, but the drones managed to sever both nacelle pylons from the engineering hull before they could jump to warp. (Star Trek Beyond)

While attempting to break the warp 10 barrier in a holographic Cochrane in 2372, Tom Paris reported a fracture in the port nacelle pylon due to subspace torque. Later, after the problem had been corrected, Paris broke the barrier with both pylons secure. (VOY: "Threshold")

In an alternate timeline in 2374, USS Voyager's nacelle pylon began to buckle as a result of encountering a moving micrometeoroid field while operating without the use of its navigational deflector. (VOY: "Year of Hell, Part II")

According to the shooting script for Star Trek: The Motion Picture, in a line cut from the theatrical film, the nacelle pylons are referred to as the "engine pylons".

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