The table provides information about underground railway systems in 6 different cities with information regarding the opening date, length of the railway and the number of passengers every year which is measured in millions.
Overall, the London railway system is the oldest and the longest railway that has ever been constructed. Furthermore, the most crowded train system is in Tokyo.
In 1863, the London opened their railway system to the public. This is the oldest railway system and the only one that was built in 1863. In terms of length, this system is one of the longest one with 394 kilometres of route. In contrast, the latest railway, which was built in 2001 in Los Angeles, only has 28 km of route.
Some of the systems which were opened in the 1900s are in Paris, Tokyo, Washington DC and Kyoto. Out of all of these countries, the longest one exists in Paris with the route length of 199km, although this is still shorter when compared to the London railway. Additionally, one of the train system with the largest number of passengers per year is in Tokyo. Every year, it helps 1928 millions of customer commute from one area to the other. The number of passenger served per year is 800 millions higher when compared to the railway in Paris. 
The table provides information about underground  
railway
  systems
 in 6  
different
 cities with information regarding the opening date, length of the  
railway
 and the number of passengers every  
year
 which  
is measured
 in millions. 
Overall
, the London  
railway
  system
 is the oldest and the longest  
railway
 that has ever  
been constructed
.  
Furthermore
, the most crowded train  
system
 is in Tokyo.
In 1863, the London opened their  
railway
  system
 to the public. This is the oldest  
railway
  system
 and the  
only
 one that  
was built
 in 1863. In terms of length, this  
system
 is one of the longest one with 394  
kilometres
 of route.  
In contrast
, the latest  
railway
, which  
was built
 in 2001 in Los Angeles,  
only
 has 28 km of route. 
Some of the
  systems
 which  
were opened
 in the 1900s are in Paris, Tokyo, Washington DC and Kyoto. Out of all of these countries, the longest one exists in Paris with the route length of  
199km
, although this is  
still
 shorter when compared to the London  
railway
.  
Additionally
, one of the train  
system
 with the largest number of passengers per  
year
 is in Tokyo. Every  
year
, it  
helps
  1928 millions of
 customer commute from one area to the other. The number of passenger served per  
year
 is 800 millions higher when compared to the  
railway
 in Paris.