Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ludhiana-metro-project-fast-track
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/tribune-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-metro-rail-corporation-dmrc
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ludhiana-d
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-transport