A Delhi-based private contractor commenced the work on May 29 and completed it a month ago.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/jan-shatabdi-gets-solar-panels-roof
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-indian-express-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-energy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rail-transport
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy