Due to an engineering flaw, pieces of concrete has been crumbling from the Frankford El since 1997. It was supposed last for 75 years since its completion in the year 2000. SEPTA has filed a lawsuit with Parsons Brinckerhoff and Sverdrup, which is now part of Jacobs Engineering Group Inc., for the cost to repair the damage. The cost: $20 million dollars or more! SEPTA is now working with Wiss Janney Elstner Associates Inc. to find a permanent solution to the problem, as they put up mesh below the structure to keep concrete from falling on the traffic below.
More details in the Philadelphia Inquirer: http://www.philly.com/inquirer/business/20090918_Frankford_El_with_potential_to_crumble_needs_repairs.html