The family of a retired California firefighter who disappeared from an Amtrak train says it now appears that he may have fallen from the train somewhere in eastern Colorado or western Nebraska.

Charlie Dowd’s family members had been organizing searches in Omaha and Lincoln for the 69-year-old San Mateo man because they believed he may have mistakenly gotten off the train at one of those stops.

But Jen Dowd said Tuesday Amtrak police told the family a passenger on the California-to-Chicago train saw Dowd standing near a train door Thursday night. Another passenger later found an exterior door ajar around 11 p.m. Thursday.

Jen Dowd says the search for her father will now focus on the 160 miles of track between Fort Morgan, Colo., and McCook, Neb.