NPR Story-Keystone trains gets on wrong track

There was a short story on National Public Radio “Morning Edition” that said that an Amtrak Keystone train got on the wrong track and ended up in a suburb somewhere. I apologize for the lack of details, but this came up suddenly and was very short. Does anyone know what happened?

“Dishwasher” gonna have some ‘splanin’ to do. [(-D]

Details are in this post, which is also on these forums:

http://cs.trains.com/trn/f/111/t/225016.aspx