Seven weeks before the Summer Olympic Games commence in Rio and a subway expansion that was supposed to transport hundreds of thousands of athletes and fans is not done While Brazilian officials insist it can still be finished in time, frequent delays, skyrocketing costs and a financing snag have created doubts Even if Rio de Janeiro completes the key part of the expansion in time, transportation experts worry it may be too late to adequately test the system before the Aug. 5 Olympics opening ceremony