like carlos horkwho fled el salr with his wife and three small children. carlos tells us families in el salvador are affected the most. his goal as a father is to keep his family safe. the shelter is crowded but father flor tells us less so than in years past. and no sign of edwin and jose. so wedrive towards riaga the southernmost stop for the freight trains that migrants calla bestia, the beast train. it's not an affectionate term, it's a term coined because so many people get hurt, maimed, killed along this train. it's one of the ways so many of these migrants get extorted. imagine climbing on this then while it's moving. but it is still the most efficient way to get north. we spot this trio walking a trail by the railroad tracks. his name is luis and he's just 19 years old. also from el salvador. he hasn't seen edwin or jose but has followed the same route almost 200 miles by foot. he leads us to a nearby shelter. you all speak a little english? >> reporter: the winds of violence from further south also sweeping in this group of destitute teens. >> this