Engineer in Hoboken train crash had undiagnosed sleep apnea: report

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HOBOKEN, New Jersey (WPIX) — Two U.S. officials say the engineer of a commuter train that slammed into a New Jersey station at double the 10 mph speed limit, killing a woman, suffered from undiagnosed sleep apnea. One of the officials says investigators are looking at it as a potential cause.

The officials were briefed on the investigation and spoke to The Associated Press on the condition of anonymity because they weren't authorized to discuss the matter.

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NJ transit train crashes in Hoboken Station
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NJ transit train crashes in Hoboken Station
HOBOKEN, NJ - SEPTEMBER 29: Train personel survey the NJ Transit train that crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: A NJ Transit train seen through the wreckage after it crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
Hoboken police officers look over the scene of a train crash where a New Jersey Transit train derailed and crashed through the station, injuring more than 100 people, in Hoboken, New Jersey, U.S. September 29, 2016. REUTERS/Shannon Stapleton
Emergency officials walk toward the Hoboken Terminal following a train crash, Thursday, Sept. 29, 2016, in Hoboken, N.J. A commuter train has crashed into the rail station during the morning rush hour, causing serious damage. (AP Photo/Julio Cortez)
This Thursday, Sept. 29, 2016 photo provided by a passenger who was on the train when it crashed shows wreckage at the Hoboken, N.J. rail station. The commuter train barreled into the station during the morning rush hour, coming to a halt in a covered area between the station's indoor waiting area and the platform. (AP Photo)
Emergency officials arrive by helicopter at Pier A Park near the Hoboken Terminal following a train crash, Thursday, Sept. 29, 2016, in Hoboken, N.J. A commuter train crashed into the rail station during the morning rush hour, causing serious damage. (AP Photo/Julio Cortez)
This photo provided by Ian Samuel shows the scene of a train crash in Hoboken, N.J., on Thursday, Sept. 29, 2016. A commuter train barreled into the New Jersey rail station during the Thursday morning rush hour, causing serious damage. The train came to a halt in a covered area between the station's indoor waiting area and the platform. A metal structure covering the area collapsed. ( Ian Samuel via AP)
An emergency official walks near the Hoboken Terminal following a train crash, Thursday, Sept. 29, 2016, in Hoboken, N.J. A commuter train has crashed into the rail station during the morning rush hour, causing serious damage. (AP Photo/Julio Cortez)
Jamie Weatherhead-Saul, center, of Woodridge, N.J., who was on the train that crashed into the Hoboken Terminal, walks away after speaking to reporters, Thursday, Sept. 29, 2016, in Hoboken, N.J. A commuter train crashed into the rail station during the morning rush hour, causing serious damage. (AP Photo/Julio Cortez)
Emergency officials stand outside of the Hoboken Terminal following a train crash, Thursday, Sept. 29, 2016, in Hoboken, N.J. A commuter train crashed into the rail station during the morning rush hour, causing serious damage. (AP Photo/Julio Cortez)
Emergency workers arrive at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. There are preliminary reports of a crash with multiple serious injuries at the station, after a train struck a train station in Hoboken, New Jersey, with reports of injuries and possible mass casualties. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: Passengers rush to safety after a NJ Transit train crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: Passengers rush to safety after a NJ Transit train crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
Emergency workers help an injured person at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A packed commuter train crashed into a station in New Jersey during the morning rush hour Thursday, with three people reported killed and more than 100 injured, many of them in critical condition. The train failed to stop as it pulled into Hoboken station,, causing major damage to the transit hub just over the Hudson river from Manhattan. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
An injured woman is evacuated at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A packed commuter train crashed into a station in New Jersey during the morning rush hour Thursday, with three people reported killed and more than 100 injured, many of them in critical condition. The train failed to stop as it pulled into Hoboken station,, causing major damage to the transit hub just over the Hudson river from Manhattan. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Emergency workers help an injured person at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A packed commuter train crashed into a station in New Jersey during the morning rush hour Thursday, with three people reported killed and more than 100 injured, many of them in critical condition. The train failed to stop as it pulled into Hoboken station,, causing major damage to the transit hub just over the Hudson river from Manhattan. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: People are treated for their injuries on the street after a New Jersey Transit train crashed into the platform at Hoboken Terminal during morning rush hour September 29, 2016 in Hoboken, New Jersey. According to reports, 3 people have been killed and over 100 injured. (Photo by Eduardo Munoz Alvarez/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: People are treated for their injuries outside after a NJ Transit train crashed in to the platform at Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: A NJ Transit train seen through the wreckage after it crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: Passengers rush to safety after a NJ Transit train crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: The roof collapse after a NJ Transit train crashed in to the platform at the Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
Emergency workers arrive at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A commuter train crashed into a station in New Jersey during the morning rush hour on Thursday, officials said, with dozens of people reportedly injured. 'Due to a NJ Transit train derailment at #Hoboken Station, NJ, all PATH train service in and out of Hoboken Station is suspended,' New York's official emergency information system tweeted. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Commuters gather at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A commuter train crashed into a station in New Jersey during the morning rush hour on Thursday, officials said, with dozens of people reportedly injured. 'Due to a NJ Transit train derailment at #Hoboken Station, NJ, all PATH train service in and out of Hoboken Station is suspended,' New York's official emergency information system tweeted. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
HOBOKEN, NJ - SEPTEMBER 29: People are treated for their injuries outside after a NJ Transit train crashed in to the platform at Hoboken Terminal September 29, 2016 in Hoboken, New Jersey. (Photo by Pancho Bernasconi/Getty Images)
Emergency workers give aid to an injured person at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A commuter train crashed into a station in New Jersey during the morning rush hour on Thursday, officials said, with dozens of people reportedly injured. 'Due to a NJ Transit train derailment at #Hoboken Station, NJ, all PATH train service in and out of Hoboken Station is suspended,' New York's official emergency information system tweeted. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Emergency workers gather outside New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A commuter train crashed into a station in New Jersey during the morning rush hour on Thursday, officials said, with dozens of people reportedly injured. 'Due to a NJ Transit train derailment at #Hoboken Station, NJ, all PATH train service in and out of Hoboken Station is suspended,' New York's official emergency information system tweeted. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Emergency workers help an injured person at New Jersey Transit's rail station in Hoboken, New Jersey September 29, 2016. A commuter train crashed into a station in New Jersey during the morning rush hour on Thursday, officials said, with dozens of people reportedly injured. 'Due to a NJ Transit train derailment at #Hoboken Station, NJ, all PATH train service in and out of Hoboken Station is suspended,' New York's official emergency information system tweeted. / AFP / Kena Betancur (Photo credit should read KENA BETANCUR/AFP/Getty Images)
⚠️NJTransit Train Struck Hoboken Terminal. Major Structural Damage, Multiple Injuries. Expect Major Delays… https://t.co/c5tSl2Wlz9
A commuter train ran right through Hoboken Station in NJ just now. https://t.co/BcizrqRgkL https://t.co/kP1KTIbdeh
Train crash at hoboken station https://t.co/Ii8IhdSadK
A train just crash into platform in Hoboken NJ. #prayforhoboken https://t.co/1soaDI4eec
Following the #Hoboken train crash this AM. Every medic, cop & firefighter is here. MANY injuries. https://t.co/YyrfinYfHo
Omg crash at Hoboken #hoboken #traincrash https://t.co/jvcIAml9Pz
A New Jersey Transit train derailed and crashed through the station in Hoboken, New Jersey during the morning rush hour.
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They told the AP on Wednesday that 48-year-old Thomas Gallagher was diagnosed with the condition after the Sept. 29 crash in Hoboken.

The National Transportation Safety Board said it wasn't able to confirm specifics of the engineer's health.

Gallagher told investigators he had no memory of the crash and remembered waking up on the floor.

A union representing Gallagher didn't immediately respond to a message.

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