Next week the National Transportation Safety Board is expected to determine the likely cause of a deadly 2015 Amtrak train derailment in Philadelphia that killed eight people, including a Maryland man.
The board is scheduled to meet May 17 in Washington D.C.
The derailment happened a year ago, on May 12, 2015. According to the preliminary report, the northbound Amtrak passenger train derailed after going into a curve at 106 mph where the restricted speed is 50 mph.
According to The Associated Press, the accident happened on a curve that is one of the sharpest on the rail line known as the Northeast Corridor.
Bridges, tunnels curves and narrows can lead to bottlenecks as four tracks are often reduced to two, limiting the number of trains that can operate.
Some of the worst of these bottlenecks along the rail line are found in Maryland at the Baltimore & Potomac Tunnel and the Susquehanna and Bush River bridges.