The rakes in pix were manufactured in Sao Paulo, Brazil. These were navigated to India on ships and then transported from Chennai Port on trailers to the Koyambedu Depot and is right now on the in-house testing 800-meter tracks. These were extensively covered by either blog posts or news items on IRI. You may find them if you look for them. These are just samples. The actual rolling stock will be done at SriCity SEZ, Tada, Andhra Pradesh, by Alstom.