The Hyderabad Airport and Metro projects have separate threads in the Infrastructure and Transportation forums (http://www.skyscrapercity.com/forumdisplay.php?f=1247). Here are the links -


Hyderabad International Airport Thread
http://www.skyscrapercity.com/showthread.php?t=516810


Hyderabad Metro Updates
http://www.skyscrapercity.com/showthread.php?t=459134


Hyderabad MMTS
http://www.skyscrapercity.com/showthread.php?t=897776