"Anyone from India - are you seeing this roadwork in reality?"
I have not seen the Golden Quadrilateral but have seen the Bombay-Pune Express highway and you have to see it to believe it. The Express highway can rival the best in the world. Now it only takes 2 and a half hours to reach Bombay from Pune. They are also building dozens of flyovers all over Mumbai to reduce the traffic.
I have also seen the new second bridge besides the Howdah bridge in Kolkata. Earlier took 2 hours from Howdah to Kolkata, now it takes 20 minutes.
With these roads, how are the rails fairing? I remember the trains from Pune to Mumbai (Sealgarh Express, etc) were always full. The fastest in those days (1980's) took 4 and half hours.