A union official says the engineer at the controls of the train that crashed over the weekend and killed four passengers says he caught himself nodding before the derailment.
Union leader Anthony Bottalico says William Rockefeller "caught himself, but he caught himself too late."
Also, investigators looking into the deadly New York City train derailment say no anomalies have been found with the train's brake system.
The Metro-North Railroad commuter train was traveling Sunday at 82 mph as it approached a 30 mph zone and jumped the tracks along a sharp curve. Four passengers died.
The National Transportation Safety Board says investigators haven't found any evidence of brake trouble during the train's nine previous stops and no problems with track signals. NTSB member Earl Weener said Tuesday there were "no anomalies."
Rockefeller was injured in the wreck and has cooperated with investigators. It says the NTSB investigation will show "there was no criminal intent with the operation of his train." The NTSB says it's still too early to say whether Rockefeller was fully conscious around the time of the crash.
But Gov. Andrew Cuomo has said Rockefeller should be disciplined for "unjustifiable" speed.