this way even the engineering expertise can also pooled within the country.
Not going to happen. We already have much engineering expertise and only one concerted push regarding Indian Railway technology, particularly Indian Rolling Stock technology is needed. First we need to get these R&D activities away from babus in Railway Board. Model an R&D organisation similar to DRDO and ISRO, with separate cadre and direct access to Railway Minister. RDSO and individual silos of R&D wings of Rail Coach Factories and Locomotive factories currently in place are not cutting it. Railway Board politics has ruined everything.
Hurdles in this are:-
1.) Railway Babus crying over lost turf.
2.) Alstom (along with their lobbies) crying over increased competition.
3.) Factories crying over lost R&D units.
Rail technology is not that hard a nut to crack (looking at what DRDO and ISRO have achieved). A centralized push is needed and within two decades we can bridge gap with China. DRDO and ISRO have a harder job to do. We already have PSU like BHEL, BEML and private sector companies like Medha Servos. Universities are mildly involved in R&D. We just need a concerted push to develop the entire gamut of railway tech in India. But the way things are going right now, I don't see it happening at all.
Instead, I don't see any push in this direction. Railway Board is managing to stop the Minister from achieving this. Forget R&D, GoI aren't even able to consolidate the Manufacturing like they promised. In the wake Alstom and its ilk happily pitch the factories in India, use Indian talent for R&D and simply control the IP and make the profits, which is then dubbed as a success story for "Make In India". And then these same Babus call themselves the champions of Indian Railway Tech (that entire drama over the gauge of Metros) fighting to keep Alstom out of Indian Railways even though Alstom is getting all the Metro contracts due to Railway Board's infighting and incompetence. Babus of our country will really end up destroying us.