An Amtrak train, top, traveling on an unaffected track, passes a derailed Metro North commuter train, Sunday, Dec. 1, 2013 in the Bronx borough of New York. Officials are standing on a curve in the tracks where the Metro North train derailed.
U.S. Senator Richard Blumenthal of Connecticut is calling on federal officials to conduct an expedited investigation into Sunday's train derailment on Metro North's Hudson line, which killed 4 people and injured more than 60.
Blumenthal cited recent incidents that impacted Connecticut commuters on the New Haven Line in his call to action.