[00:00.00]In most subways,there are stations
[00:04.12]about every one kilometer along the route.
[00:08.20]Most subway are very modern and clean,
[00:12.34]but they can get very crowded sometimes.
[00:14.88]So,people have to follow certain rules
[00:18.36]to make the trip more comfortable.
[00:21.12]In London,when people use the Tube,
[00:24.79]they must stand on the right
[00:27.06]so that people in a hurry can walk on the left.
[00:31.86]They let passengers get off the train
[00:34.78]before others get on,
[00:37.64]and people are expected to give up their seats
[00:42.08]to old and disabled people.
[00:45.31]Some subways provide frequent services.
[00:49.75]Trains arrive at a station
[00:51.90]about every two minutes.
[00:54.55]Subways carry a lot of passengers.
[00:58.32]The number of people traveling oneway each hour
[01:02.30]in London can be about 30,000.
[01:06.52]However,in some cities it is much higher.
[01:10.77]Hong Kong's subway holds the record
[01:14.17]of about 80,000 passengers an hour.
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