Delhi Metro Rail is one of the best transport in delhi. It safe time, petrol or safety. Its the best quality is fare which is less or through travel with card it gives 10% discount on every fare. It is semi government company joint venture with Delhi government and Delhi metro. Cleanliness is good. Day by day metro is prepared for other phases. It is good for public to travel any convienance. No traffic problem. I am travelling almost daily through delhi metro. The airport line of the delhi metro is very neat and clean. The fare of airport line is reduced by 50% by its previous fare. I think delhi metro is best in construction and technology. It gives many jobs to people with salaries according to their post. Thankful to our civil engineers which were build or work on the project of DMRC.