The entire set of the beam, the bogies, the wheels, etc. is more complex and expensive for a monorail. Monorail requires a lot of stuff around the beam, often made of expensive rare metals, with a lot more maintenance. Monorail beam itself must be built and maintained to high specifications.
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Monorails lack flexibility and are not really suitable for anything beyond short loop routes. Plus, you're married to the technology of whoever builds the system. Not everyone can build a monorail, yet many manufacturers can make equipment that runs on two rails.
Monorail requires the lowest operating and maintenance costs of any mass transit system. Elevated monorail cars are much less likely to suffer vandalism and often remain much cleaner than ground based rail.
Monorails can't compete with buses and light rail systems used in large cities today. Monorails are expensive not only to build but to run and repair. Building large concrete pylons and stations above cities is more expensive than the building of light rails, which require only stations and tracks at ground level.
The primary advantage of monorails is due to the smaller size of a beam compared to rails. This may translate to cost reduction due to less material needed for support pillars. Also, compared to elevated trains, the beam blocks less sky and may be less aesthetically displeasing.
One of the biggest disadvantages of monorails are difficulties switching them between tracks—there's no technology to provide for a high speed switch, and compared to rail infrastructure, the switches are expensive and trouble prone.
Driverless operationInnovia Monorails are all fully automated and use a variety of train control technologies. However, the Riyadh and São Paulo monorails are both equipped with CITYFLO 650 communications-based train control.
Modern monorails rely on a solid beam as the running surface and are divided into two classes: straddle-beam and suspended monorails. Straddle-beam monorails are more common, with trains straddling a steel or reinforced concrete beam. Suspended monorails, like the Wuppertal Schwebebahn in Germany, are less common.
Many monorail systems run through crowded areas such as Detroit, MI. Aside from mass transit and people mover systems, a large number of smaller monorails have been built in amusement parks and at zoos.
It isn't cost-effective.On top of the operation of a Monorail, it takes an entirely unique staffing situation. The Disney Skyliner is operated by Attractions Cast Members, the same as any other ride or show around the Walt Disney World Resort.
The accident occurred when the Pink monorail backed through an improperly aligned switch-beam and struck the Purple monorail. An operator and six passengers were on board the Purple monorail at the time of the collision.
The Walt Disney World Resort currently operates twelve Mark VI monorail trains on three lines of service. The monorail system opened in 1971 with two routes and with Mark IV monorail trains. It was expanded to three lines in 1982, and switched to Mark VI trains in 1989.
A surviving suspended version is the oldest still in service system: the Wuppertal monorail in Germany. Also in the early 1900s, Gyro monorails with cars gyroscopically balanced on top of a single rail were tested, but never developed beyond the prototype stage.
(CNN) -- Two monorail trains at Walt Disney World collided early Sunday, killing a 21-year-old driver. A 2 a.m. ET monorail crash at Disney World killed one person, a park spokesman said.