The given table provides the data of underground railway systems in six cities, including it data opened, route length and numbers of passengers in each city per year .
Overall, most of them were opened before 21th century, such as Kyoto, Paris, Tokyo etc., exept London, which was erected in 19th century. All the numbers of route length vary greatly, however, the shortest is Kyoto and Los Angeles, the smallest number of people in these underground railways respectively.
In terms of date opened, Los Angeles is the only city, where the underground railway was opener in 00s century, meanwhile the oldest is Londons underground railway, which was erect in the 1863. The longest underground railway is Londons one, which is just under 400 kilometres, whereas all others varies between 199 and 11 kilometers.
Passegers per year was the third category, which shows that the most crowded underground railway is Tokyo, which has 1928 millions of people, who used Tokyos railway per year. On the other hand, Kyoto is the most unpopular one and approximately in 45 times less used per year, while all others is between 50 and just under 1200 millions per year.