The article from Business Insider discusses a tragic train crash in Hoboken, New Jersey, where the engineer, Thomas Gallagher, had undiagnosed sleep apnea, which is believed to have contributed to the accident. The crash, which occurred on September 29, 2016, resulted in the death of a woman on the platform and injured over 100 people. Gallagher, who had worked for NJ Transit for nearly 18 years, was found to have severe sleep apnea only after the crash. This condition likely led to extreme daytime drowsiness, causing him to lose control of the train, which was traveling at double the speed limit when it crashed into the terminal. The incident has since raised concerns about the need for more stringent health screenings, including sleep apnea testing, for train engineers to prevent similar tragedies in the future.