The estimates are highly boosted up with 90% of Underground routes.
Only 10% of Underground routes are necessary in these routes.UG tracks are ten times costlier than the over head track routes.
The international firms / politicians are very much interested in the boostup estimates .The boostup estates are boosted the cost of operation with high fares for the passengers.
...
more... So the patronages decreases and never recover investments and so the boostup UG investment s are further liability to the exchequer with ever rising interest components.
So wherever possible Ground level with side barriers / over head tracks have to be formed to reduce the implemented cost ,operation cost and impose less fares.