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.
train track
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).
railroad
Railroad
Siding
Siding
Trains acquire traction to move along the tracks through the friction between the steel wheels of the train and the steel rails of the track. This friction allows the train to grip the track and propel itself forward. Additionally, some trains use electric motors or diesel engines to provide the necessary power for movement.