The film “Which Way Home,” an official selection of the 2009 Tribeca Film Festival and the 2009 Los Angeles Film Festival, views the immigration issue through the eyes of children who face harrowing dangers as they journey to the United States. It follows unaccompanied child migrants traveling by freight train through Mexico, including Jose, a nine-year-old El Salvadoran, who has been abandoned by smugglers and ends up alone in a Mexican detention center, and 14-year-old Kevin, a streetwise Honduran who hopes he will find work in New York City in order to send money back to his mother.