FILE - In this Jan. 4, 2017 file photo, an injured passenger is taken from the Atlantic Terminal in the Brooklyn borough of New York after a Long Island Rail Road train hit a bumping block. Federal investigators have found that the engineers of two New York City-area commuter trains that crashed into stations were both suffering from severe sleep apnea. The National Transportation Safety Board said Thursday, Sept. 21, 2017,  the similar circumstances of the crashes warranted combining findings and recommendations into a single special report. (AP Photo/Mark Lennihan)
FILE - In this Jan. 4, 2017 file photo, an injured passenger is taken from the Atlantic Terminal in the Brooklyn borough of New York after a Long Island Rail Road train hit a bumping block. Federal investigators have found that the engineers of two New York City-area commuter trains that crashed into stations were both suffering from severe sleep apnea. The National Transportation Safety Board said Thursday, Sept. 21, 2017, the similar circumstances of the crashes warranted combining findings and recommendations into a single special report. (AP Photo/Mark Lennihan) Credit: Mark Lennihan

The engineers of two commuter trains that slammed into New York City-area stations in the last year were both suffering from severe sleep apnea and have no memory of the crashes, according to investigative reports and interview transcripts made public Thursday.

The National Transportation Safety Board said the common circumstances of the Sept. 29, 2016, New Jersey Transit crash in Hoboken, New Jersey, and the Jan. 4, 2017, Long Island Rail Road crash in Brooklyn warranted combining findings and recommendations in a single investigative report to be released early next year.

Neither engineer had been diagnosed with sleep apnea before the crashes, according to the documents. People with the disorder are repeatedly awakened and robbed of rest as their airway closes and their breathing stops, leading to dangerous daytime drowsiness.

NJ Transit engineer Thomas Gallagher told investigators he only remembered looking at his watch and the speedometer, blowing the horn and ringing the bell before his packed rush-hour train slammed into Hoboken Terminal at more than double the 10 mph speed limit.

A conductor standing on a platform told investigators he couldn’t see the engineer through the cab window as the train rumbled into the station, indicating Gallagher may have slumped down or fallen.

Falling debris from the impact killed a woman standing on a platform. About 110 people aboard the train were hurt.

“The next thing I remember was a loud bang,” Gallagher recalled, according to a transcript of his Oct. 1, 2016, interview. “I was getting hit with dust and dirt. I was thrown about the cab. I hit my head, the back of my head, I presume on the wall behind me. And then I had a period where I was going in and out of consciousness.”

LIRR engineer Michael Bakalo told investigators he only remembered approaching Atlantic Terminal in Brooklyn and then getting thrown from his seat. He said he wasn’t aware of the impending crash. More than 100 people were hurt when the train crashed into a bumping post at the end of the tracks.

The impact launched the lead car into the air and it came to rest on top of the concrete platform.