The construction of the first corridor of Thane Metro is expected to start in May and likely to be over by 2014.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/belapur-pendhar-metro-corridor-construction-begin-may
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thane-d
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-transport
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/development
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-metro-rail-corporation-dmrc