The highest ridership of Washington D.C. metro on record is about 800,000 trips per weekday while that of Delhi has already crossed twice that figure 1600000 lakhs, 1.6 million. My worry is that the system is new now. Will it still be efficient when it's not new?

I have had to give up using public transport a number of times due to the inconvenience of using it, the time it consumed and frequent breakdown of escalators. You actually save time and money when you use Delhi Metro instead of your car. Higher population density of Delhi area is one big factor pointing to the fact that American model of suburban sprawl is not a sustainable one, not for India and not even for America.