What is a monorail? The dictionary tells us:
MO*NO*RAIL n. 1. A single rail serving as a track for passenger or freight vehicles. In most cases rail is elevated, but monorails can also run at grade, below grade or in subway tunnels. Vehicles are either suspended from or straddle a narrow guideway. Monorail vehicles are WIDER than the guideway that supports them. This should not be confused with a 2 rail elevated or subway lines.

History

The monorail first came about in 1901. It was built in Wuppertal, Germany. Dr. Axel Lennart Wenner-Gren was a Swedish industrialist. In 1952 he was the first person after World War II to build a monorail test track. His design was geared more to a high-speed system that could get you from city to city. He thought it might be an easier way of transportation. It could reach speeds up to almost 160 km an hour. This was called the Alweg System. Even though it was a great design it wouldn't be used until a later system was developed in 1957. In 1956, the Skyway Monorail was built in Houston, Texas. It was only a test track and it was taken apart after months of testing. It was rebuilt at the Texas State Fairgrounds and ran for many years. In 1957, Japan built its first monorail at Tokyo's Ueno Zoo. Japan would later build more monorails than any other country in the world. The Alweg monorail was built in Disneyland in 1959. In 1957, the French bridge builder, Louis Chadenson, decided to combine rubber tires with a protected steel or concrete box-beam above the train. This is known as the Safege system. In 1962, Seattle used the first dual-rail Alweg system at its World's Fair. Seattle voters approved the expansion on the monorail into a citywide system.

Now

Monorails are still in use today, in Japan for example, and operate at a profit. Now monorails are used more often. But still not that often. They are at a lot of places. There are sometimes monorails at airports. There are also monorails at amusement parks. There is a monorail at Walt Disney World. At some places there are monorails in public. But that isn't very often because they are hard to make. People confuse any type of elevated rail system as being a monorail and that is not true. Monorail vehicles are WIDER than the guideway that supports them. This is what makes them a true monorail. Today Alweg systems exist all around the world.

In 1997, Jacksonville, Florida, opened its newest automated monorail system. Additional vehicles can be added to trains as the system grows.

Later 

Future plans for monorails involve plans for a high speed suspended monorail, called the Aerorail, which would operate from Northern Kentucky to Cincinnati, Ohio.

Scientists know that monorails don't pollute the earth. So they think in the future there will be monorails all over. Instead of cars there will be just monorails. Many things will benefit from this. It will help many animals. It will also help the environment. Scientists say that since it doesn't make bad fumes that we breathe in, it will help us. It will also help stop global warming. My opinion on this is that we might have monorails all over because they help the environment. But I think that we will still have cars. I think this because a monorail can't take us directly where we want to go like our homes.