 Gallagher, aged 48 and with 18 years experience as a train engineer, said he had no memory of the crash and was lying on the cab floor when he woke up after the impact.An official briefed on the investigation told The Associated Press under condition of anonymity that the investigation is considering sleep apnea as a possible cause of the crash.Hoboken Terminal has the original steel-and-concrete bumpers from when it was opened in 1907.