In a statement issued Friday, the NTSB said the engineer of the eastbound train that derailed told investigators he noticed "an unusual condition on the track" as the train approached the area of the derailment in Bridgeport, Conn.

WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail

Then I saw what seemed to be a pamphlet in the open book, and as the train approached Union Square I offered my seat to an unpleasant woman who denied that she was pregnant and staggered across the jolting subway car to have a better look.

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Dharmesh Patel noticed on CCTV that a van had "zipped" under a level crossing gate but could not get through the next barrier as a train approached.

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In early December, Ki-Suck Han, 58, was shoved onto the tracks in a Times Square station as a train approached.

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The engineer on the second train has told investigators that both appeared to be operating normally as they approached each other, just outside a curved stretch of track in Bridgeport, according to Mr. Cahill.

WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail