Need Xbee module for minimum 500 indoor high interference area serial communication

I need xbee module to cover atleast 500 meters of indoor distance in high interference area.Sites where i will use the product can thought of railway stations.I should support serial data between 8052 microprocessor and computer.

Sounds like you are looking for product selection help is that correct?

Yes, correct i need product selection help.I had selected the Xbee s2 but it gives only 5 to 6 meters indoor communication.Now I need at least 500 meters serial communication between 8052 microprocessor and computer room.