As a train roared in the distance, some 5,000 mostly Venezuelan migrants hoping to make it to the U.S. snapped into action.
Families with young children sleeping on top of cardboard boxes and young men and women tucked away in tents under a nearby bridge scrambled to pack their things. After the train arrived on the outskirts of the central Mexican city of Irapuato, some swung their bodies over its metal trailers with ease, while others tossed up bags and handed up their small children swaddled in winter coats.
