The table shows data about the underground railway systems in six major cities with the date opened, kilometers of the route, and passenger numbers per year in millions.

The table compares the six networks in terms of their age, size and the number of people who use them each

year

.

It is clear that

the three oldest underground systems are larger and serve significantly more passengers than the newer systems. The London

underground

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Underground

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is the oldest

system

, having opened in 1863. It Is

also

the largest

system

, with 394

Kilometres

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kilometres

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of route. The second largest

system

, in Paris, is only about half the size of the London underground, with 199

kilometres

of route.

However

, it serves more people per

year

.

While

only third in terms of size, the Tokyo

system

is easily the most used, with 1927 million passengers per

year

. Of the three newer networks, the Washington DC underground is the most extensive, with 126

kilometres

of route, compared to only 11

kilometres

and 28

kilometres

for the Kyoto and Los Angeles systems. The Los Angeles network is the newest, having opened in 2001,

while

the Kyoto network is the smallest and serves only 45 million passengers per

year

.