The table compares the underground railways systems of six cities around the world in terms of date opened, length and numbers of passengers carried.

It can be seen that London has by far the oldest system, opened in 1863, followed by Paris in 1900. The Tokyo system was opened in 1927 but the other three cities - Washington, Kyoto and 
Los Angeles all have comparatively recent systems.

The London underground is also considerably longer than the others. At 394 kilometers, it is around twice as long as the next longest system, Paris. Washington and Tokyo both have systems over 100 kilometers, while Kyoto and Los Angeles have very small systems of under 30 kilometers.

Surprisingly perhaps, the number of passengers per year does not reflect the length for the four largest systems. Tokyo, the third largest in terms of length, is far and away the busiest, carrying 1927 million passengers per year. That is almost twice as many as Paris, almost three times as many as London and over ten times as many as Washington, whose system is only 29 kilometers shorter.

Overall it can be seen that the oldest systems are the largest and the busiest.

and numbers of passengers carried.
around the world 
compares 
in terms of date opened, 
length 
of six cities 
The table
the underground railways systems 	all have comparatively recent systems.
but the other three cities - Washington, Kyoto and Los Angeles 
by far the oldest system, opened in 1863, 
followed by Paris in 1900. 
It can be seen that London has 
The Tokyo system was opened in 1927 	
At 394 kilometers, 
it is around twice as long as 
both have systems over 100 kilometers, 
considerably longer than the others. 
have very small systems of under 30 kilometers.
The London underground is also 
the next longest system, Paris. 
Washington and Tokyo 
while Kyoto and Los Angeles 	almost three times as many as London 
and over ten times as many as Washington, 
carrying 1927 million passengers per year. 
does not reflect the length for the four largest systems. 
is far and away the busiest, 
Surprisingly perhaps, 
That is almost twice as many as Paris, 
the number of passengers per year 
Tokyo, the third largest in terms of length, 
whose system is only 29 kilometers shorter.	
are the largest and the busiest.
Overall it can be seen 
that the oldest systems