They don't! (Unless they are cable, battery, steam or horse drawn trams).
A tram can be a monorail without wheels.
The majority of trams are powered by electricity, however some older trams are powered by steam or diesel. Tram travel on tram rails. These are similar to train rails, but there are some important differences.
Trains don't use electricity it uses coal trams use however electricity.
Trams are not bad for the environment, though if there a lot of them then sometimes they can cause damage. It would be best not to use trams.
desa
The motto of Yarra Trams is 'Love Your Trams'.
Trams are run solely on magnetic pull from one end to the other; thus making the tram a giant magnet being pulled positively via the negative end, and negatively via the positive end
Trams were used in Auckland between 1902 to 1956. (Electric trams).
Inekon Trams was created in 2001.
Yarra Trams was created in 1999.
Trams in Milan was created in 1876.
Trams in Turin was created in 1871.