So before Trump takes office on Friday, they are racing against time, riding a freight train up to the border to look for a way across.
In the town of Caborca near the frontier, a group of Hondurans warm themselves by a fire of trash in the early morning cold.
One of them, Wilson, a 48-year-old builder, missed the birth of his daughter to make the journey. Getting to the United States before Trump takes control was more important.