On rails
Trams are a familiar sight in Hong Kong - on the island that is. A tram is a vehicle that travels on rails. The first one was made in Wales more than 200 years ago. The first trams were not electric. They were pulled by horses, or sometimes mules.
In the beginning, trams were created because roads in the old days were not very good. Horses had to work very hard to pull a vehicle along a street with holes in it and sometimes snow and rubbish. People realised that if you put metal tracks on the road, metal wheels could roll along them easily. This made it easier for horses to pull them.
Horses to electric
In 1917, New York replaced its last horse-drawn tram line with an electric one. But Hong Kong was ahead of New York. Hong Kong started using electric trams in 1904. The other special thing about Hong Kong's trams is they are double-deckers. Only two other places in the world have them - Blackpool in Britain and Alexandria in Egypt.
Hong Kong was not the first place in the world to have electric trams. Probably the first one was made in Germany about 10 years earlier. Melbourne, in Australia, had its first trams in 1885. They are still running and Melbourne has the biggest tram network in the world. It has 245km of tracks and about 500 trams.