This is a view of one of the massive engines used to run the compressors. One of the 6 cylinders is visible on the left of the shot. I am not exactly sure how to give you a sense of scale here, other than to mention that the camera is at eye level (and looking up). The gold highlighted device with all the glass tubes in the foreground is a lubricator. Small metal lines spread forth from here to various points on the engine.