[00:00.00]Unit 8 Transportation
[00:07.26]Expansion 8
[00:08.64]3 In many large cities
[00:12.48]there is a subway system of underground trains.
[00:17.73]Cities have different names for their subways.
[00:22.30]The London Underground is called The Tube.
[00:26.32]In San Francisco,it is called BART
[00:30.69](Bay Area Rapid Transit).
[00:34.20]Some subway systems,like Chicago's,
[00:37.44]for example,are quite old.
[00:40.86]It opened in 1897.
[00:44.92]Others are more recent.
[00:47.77]For example,Mexico City's subway
[00:51.21]started in 1969.
[00:55.17]In a subway,the train lines
[00:58.86]form a separate transportation system.
[01:02.36]They usually go through underground tunnels
[01:05.68]in the center of the city and above the ground
[01:09.54]on the edge.
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