The table illustrates the operation of the underground rail network with 3 types, including age, size and people using.
Overall, when compares six networks, it can see that the oldest systems were London, Paris and Tokyo had the larger about size and the amount of passengers who use them each year more than the new systems, consisting Washington DC, Kyoto and Los Angeles.
It is clear that the oldest system was London, constructed in 1863. At once, being the largest size of the route, at 394 kilometers. However, the people used this system was lower than Tokyo with 1927 million people-the third rank in size of the route. The second system lasts 199 kilometers was Paris, less than London 3 times but having the number of passengers much more than London.
With 3 cities having the new systems, Washington DC underground was the most extensive when the length of the route was 126 kilometers. It is also the most about the number of people used the system, significantly more than the rest of cities were Kyoto and Los Angeles, at 45 million and 50 million people respectively. Los Angeles reached the newest system about the time it opened since 2001. Though having the size of the route was lower than Kyoto, people used the underground of this city was higher than Kyoto.