An investigation by the National Transportation Safety Board (NTSB) into the June 22 crash of two Washington, D.C., Metro trains is now focused on electrical circuits, sensors and 30-year-old electrical components. According to an NTSB release, track circuit modules -- each of which contain 20 circuit boards with capacitors, resistors and transistors -- showed "anomalies" which are under further investigation. In a Washington Times interview, Metro General Manager John B. Catoe said that findings could affect rail operations around the country, as many systems use the same type of equipment.

A report following the accident also says that use of cell phones, PDAs or other such devices by operators will be cause for immediate termination.

Wayne Hanson  |  Senior Executive Editor, Center For Digital Government