A monorail
no it's an underground train system
Lots of them, both above and below ground. See related link.
Just add or subtract (depending on the direction) the speed of the ball (in relation to the train) to the speed of the train (in relation to the ground). The above assumes the speeds are not close to the speed of light; if they are, more complicated formulae are required.
Known as Maglev (derived from magnetic levitation), it is a method of using magnets to raise a train above the ground, and in propulsion. This reduces friction by a great extent and allows for very high speeds.
The maximum width of a train depends on multiple factors, such as where the train runs - an underground train is less wide than a regular above-ground train. In Continental Europe, the maximum width is 3.15 metres (10ft 2in). In Britain, it is 2.9 metres (9ft 6 in)
Train Above the City was created in 1988.
As its name suggests, it floats (or levitates) above the ground. Additionally, it has no traditional "rails" to make clacking sounds with.
Cabbages grow above ground
They live above ground.
Above Ground was created in 1983.
It grows above ground.
Maglev trains use powerful magnets to create a magnetic field that lifts and propels the train above the track. This technology allows the train to levitate and move without touching the ground, reducing friction and increasing speed and efficiency.