The Kolkata Airport, Metro/trams/suburban and other forms of surface transportation projects have separate threads in the Infrastructure and Transportation forums (http://www.skyscrapercity.com/forumdisplay.php?f=1247). Here are the links -


Kolkata Airport updates
http://www.skyscrapercity.com/showthread.php?t=612550


Kolkata Metro Updates
[/B]http://www.skyscrapercity.com/showthread.php?t=612876


Kolkata Bus Rapid Transit System

http://www.skyscrapercity.com/showthread.php?t=1340457

Kolkata Howrah Suburban Railways and Circular Railway

http://www.skyscrapercity.com/showthread.php?t=1106207