If they were not underground they would be called a railway. they are put underground because the railways that run on the surface use up large tracts of valuable land. by putting them underground the land can be used for buildings.
The prefix sub- means below, so the subway is a way to get around underground.
Because it is less money though more clasterfobic..... good question
Underground Metro Station is an antonym for subway.
Underground Metro Station is an antonym for subway.
The underground transportation in California is a subway.
Underground
Underground
You can be a subway manager.
Underground railways are known, in the USA, as the subway.
The London Underground, usually referred to as just 'the underground' or 'the tube'.
Yes, you can play Scrabble in a Subway (either with underground trains or with a sandwich.
Subway
Subway
Subway