Take a trip! Tokyo Monorail. Very impressive.
Duration: 1 min. 23 sec.
Video by: seawildearth
A Monorail is a railway system in which the track consists of a single rail, typically elevated and with the trains suspended from it. The term is also used to describe the beam of the system, or the vehicles traveling on such a beam or track. Monorail systems have been built in many countries around the world, many of them on elevated tracks through crowded areas that would otherwise require the construction of expensive underground lines or have the disadvantages of surface lines.
Tokyo Monorail (Wikipedia)