The cell nucleus is one of the largest organelles found in cells and also plays an important biological role. It composes about 10% of the total volume of the cell and is found near the center of eukaryotic cells. Its importance lies in its function as a storage site for DNA, our genetic material.
A monorail is a railway in which the track consists of a single rail. The term is also used to describe the beam of the system, or the vehicles traveling on such a beam or track.
Now, if you have the need for an entirely elevated line within a high-density development, the advantage of the monorail is its relatively narrow elevated structure. Its cost is not substantially different from, say, a light-rail elevated structure, however, its size is smaller.