Engineering section

The engineering section is a common feature of Federation starships. It is a large, cylindrical section of the ship that usually houses the ship's engineering areas, separating them from the ship's bridge and crew quarters, which are usually housed in a disc-shaped hull component. The engineering is connected to the ship's warp nacelles by additional struts.

The engineering section of a Galaxy-class starship is often described as the secondary hull (with the saucer section referred to as the primary hull). In this class, the engineering section can separate from the saucer section and operate independently, albeit with somewhat less power, since the saucer section has impulse engines that will not be available while the ship is separated.