El trocadero was a processing center located in the city of Chihuahua, Mexico. People from throughout Mexico came here in order to obtain a contract to work in the United States. Braceros needed identification papers and references in order to be eligible for the program. References could be obtained from local officials that could verify that you did indeed have farm experience. American farmers were looking for people that had expirience on farms. Later other processing centers were opened in other parts of Mexico. It could take from 3 to 10 days in order to get a work contract. Once a bracero had a contract, he would be sent to Juarez, Chihuahua, Mexico by train or bus. They would be off loaded and they would then walk to the bridge to cross into El Paso, Texas. When traveling by train to Juarez, the trip could be uncomfortable as a large number of people were placed in mining rail cars. In El Paso, braceros were deloused immediately upon entering the U.S. using a white powder. The El Paso County Coliseum served as contract signing center but the main center was called Rio Vista located in lower valley of El Paso County. Their they were given physical exams. Once a person passed the exam, they would then sign a second contract with the actual farmer hiring them.