Magnanimous Metros!

So Tokyo has the largest ridership when it comes to urban metro rail systems. Followed closely by the South Korean capital, Seoul. New York is only on the 7th spot. And three of the cities in between are from China (Beijing, Shanghai, Guangzhou). Moscow clearly makes it to the top 7 too.
While London underground is undoubtedly the oldest running and first in the world, one of the newest to join the fray, Dubai Metro, has the longest driver-less automated metro! isn't that amazing?
while there is significant progress in the technological advancement, i hope that enough safety mechanisms are also in place everywhere. For eg, today, a metro train was stuck for over an hour in the underground tunnel of the Delhi Metro's Yellow Line track. Causing huge discomfort and delays to passengers, it posed a great deal of health and safety hazards too. Minor glitches are not so threatening, but being stuck in a tunnel metro with lights out and no ventilation is definitely not the experience that commuters look forward to during their rush to the office.