Dear Dr. Guttikunda,
Thank you for providing the respective list of potential sources. Below are some comments/questions that I have:
1.) The source in point 1 refers to an OSM file wherein I will have to extract the roads and railways data separately. I am currently using the roads and railways shapefile for India from Digital Chart of the World (vmap0). However, this file was last updated in 1992 and made available to public in 2006. I was interested in obtaining similar files, but for the years after 2007.
2.) The source in point 4 (SEDAC) also obtains the data for India from vmap0.
3.) Mapcruzin contains railways and roads data that is based off OSM 2014. While the railways data is comparable to the vmap0 data that I am currently using, the roads data however seems more comprehensive in vmap0 relative to the mapcruzin source. Is mapcruzin an official source? The readme file says cautions the user about the accuracy of the shapefile.
4.) Is there an official data source (similar to diva-gis or digital chart of the world (vmap0)) that contains railways and roads shapefiles (polyline) for years after 2007?
Thanks in advance for your help with this. I really appreciate it.