Investigators looking into the fatal Washington, D.C. train crash hope they can get some information from the surviving driver. He's been released from the hospital and the National Transportation Safety Board hopes to get an interview today. Meantime, federal investigators say they are looking closely at a track circuit near where the deadly transit train crash occurred. Nine people died. Debbie Hersman of the NTSB says five of six circuits, or stretches of track, in the area showed no problems during tests yesterday. But she says there were anomalies with the sixth circuit. Hersman would not elaborate on what those might be, saying more tests are needed. Equipment along each circuit receives signals that generate speed commands for the train. Hersman said the circuit in question is about 740 feet long.