Most use a "third" (or power) rail.
The Track doesnt need to be elevated, it was chosen to in The Emsland & Shanghai So the terrain/buildings etc. wouldnt be so much affected.
Some of the fastest trains in the world are Belgium's HSL-1, China's CRH380A, Germany's Transrapid TR-09 , Japan's Shinkansen train, and Shangai's magnetic levitation (maglev) train.
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No because they use different currents, track sizes, and power methods (2 and 3 rail).
Transrapid Maglevs Electric is one unit. This is the fastest rail vehicle in the world.
Electromagnetism was discovered in 1911 and it led to the mag-lev trains. These trains made rail travel much faster and used less energy.
It varies, but in general "metro trains" are electric trains, with power in every car.The power is usually DC and is supplied via a "third rail" (usually to the side of the running rails).
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in 1980, new trains stopped doing that but on some trains such as the HST, they still