I had earlier overestimated the civil costs for Kochi metro by a factor of 2, as the civil works was 25-30% not more of the entire project cost. So with the same Rs50K crores, one can in principle connect all major towns in KL with an elevated expressway. (TVM-Kochi-Kozikode-Kasargode).
The story does not end there, as the Bengaluru elevated expressway was costed in 2010 at Rs 25 crores per km. So it should be not more than 500km * 25 crore = 12,500 crores. Add a factor of 2 at most and it is still half of the estimate from Kochi metro's civil construction costs.
