A worker guides heavy machinery as it rolls near the tracks at the site where a deadly train derailment happened earlier in the week, Friday, May 15, 2015, in Philadelphia.  Amtrak is working to restore Northeast Corridor rail service between New York City and Philadelphia. Service was suspended after a train derailed in Philadelphia on Tuesday night, killing eight passengers and injuring more than 200.  (AP Photo/Julio Cortez)

Wreckage is removed from Amtrak crash site

Joseph Boardman, Amtrak president and CEO, said in a letter on Amtrak’s official blog Thursday that it is cooperating fully in an investigat…