Land acquisition seems to be the biggest roadblock for the Railways' ambitious high-speed rail corridor project.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/land-acquisition-brakes-high-speed-corridor
[2] http://admin.indiaenvironmentportal.org.in/category/author/neha-shukla
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-lucknow
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land-acquisition
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rail-transport
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport