To my understanding the QRC is a joint venture between Qatari Diar and Deutsche Bahn International for the preliminar conceptual design.

The last update released is: In February 2011, companies were prequalified for the preliminary design consultancy contract.

And also it is only in 2012 when the construction is expected to start .

So it seems like the QRC has not yet been "created". Instead I would suggest to contact Qatari Diar for details.

Regards!!