Not all trains are the same: these are just some of the variations around the world.
Monorail
A monorail train runs on a single rail instead of on a track or two rails. It's either suspended from the rail or straddles it. The tokyo monorail in Japan carries 100 million passengers a year. There are also monorails in malaysia, Australia and the USA. Several American airports have monorails , as does Disney world in Florida.
Maglev
The name maglev comes from the words magnetic and levitation. These trains do not run on a track, but float above it by means of magnetic repulsion. The lack of contact means there is no friction, so trains can travel very smoothly at high speed - up to 650km/h - and use little energy. A new 160km Maglev line is being built in 2006- 10 to connect Shanghai to hanzhou, China it will be the worlds first inter city maglev service.
Rubber-tyred metro
These electric runs along a tracked roadway on rubber tyres. They quiet, and can accelerate quickly and takle slopes. They first can ran in Paris in the 1950s and have been introduced in other french cities as well as in Santiago chille, Mexico City and Montreal, Canada.
Funicular
Funicular (from the Latin funiculus, a thin rope) are designed to go up and down steep hills or mountain, cars are drawn up by cables and descend by gravity. Function are used in Montmartre in Paris, and montjuic in Barcelona, the steepest passenger funicular Is the katoomba scenic rallway in new south Wales, Australia.