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rvnl indian railway project infrastructure eastern railway infrastructures metro kolkata make in india fast track project mtp ministry of railway fast track west bengal dankuni turnkey project capacity augumentation dakshineshwar prayagraj important bridge the ganges kali temple india engineering marvel unique railway rvnl project railways psu education project management motivation rajesh prasad cable stayed bridge cable stayed bridge construction in india orange line challenging project madhya pradesh 3rd line project gujrat dabohi navdeep dham river bhagirathi new line challenging se railway project execution green transportation electric traction south eastern railway haldia green transport viaduct rob bardhman flagship project rail cum road bridge