A Honduran woman who is nine-months pregnant, her partner and the parents of a three-year old boy from El Salvador walk on the train tracks in Saltillo

A Honduran woman who is nine-months pregnant (L), her partner (R) and the parents of a three-year old boy from El Salvador walk on the train tracks in Saltillo August 4, 2014. The two couples plan to catch the cargo train, nicknamed La Bestia (The Beast), to the U.S. Thousands of young people are hoping to reach the U.S. from their impoverished and violent homes in Central America. REUTERS/Daniel Becerril (MEXICO – Tags: SOCIETY IMMIGRATION)