McGruber writes: Last Tuesday evening, northbound Amtrak Northeast Regional train No. 188 derailed on a curve in Philadelphia, killing eight passengers. The train was traveling in excess of 100 mph, while the curve had a passenger-train speed limit of 50 mph. In response, the Federal Railroad Administration (FRA) is issuing formal emergency orders that will require Amtrak to make sure automatic train control systems work Northbound through Philadelphia at and near the site of the derailment. The FRA is also requiring that Amtrak assess the risk of all curves along the NEC and increase the amount and frequency of speed limit signs along the railroad. FRA's emergency order is newsworthy because Amtrak's existing signal system could have been configured to prevent a train from exceeding speed limits, according to the Wall Street Journal.