I believe this is why the Pennsylvanian (42/43) are in a service disruption today.
<freight> Train Derailment in Altoona
http://www.wearecentralpa.com/story/d/story/train-derailment-in-altoona/38184/ge_meH_xSU-KEGomqqXsOg
<freight> Train Derailment in Altoona
http://www.wearecentralpa.com/story/d/story/train-derailment-in-altoona/38184/ge_meH_xSU-KEGomqqXsOg